diff --git a/src/chatbot/chatbot_thread.py b/src/chatbot/chatbot_thread.py
index 1c8d8f671..101b084ab 100644
--- a/src/chatbot/chatbot_thread.py
+++ b/src/chatbot/chatbot_thread.py
@@ -162,15 +162,41 @@ def is_ollama_running():
 
 
 def start_ollama(stop_flag=None):
+    """Start Ollama server silently in the background (no terminal window)."""
+    cmd = ["ollama", "serve"]
     if os.name == 'nt':
-        subprocess.Popen('start cmd /k "ollama serve"', shell=True)
-    else:
-        subprocess.Popen(
-            ['bash', '-c',
-             'x-terminal-emulator -e "ollama serve" || '
-             'gnome-terminal -- ollama serve || '
-             'xterm -e "ollama serve"']
-        )
+        import shutil
+        # If 'ollama' is not directly callable from PATH, check default install locations
+        if not shutil.which("ollama"):
+            local_appdata = os.environ.get("LOCALAPPDATA", "")
+            possible_paths = [
+                os.path.join(local_appdata, "Programs", "Ollama", "ollama.exe"),
+                r"C:\Program Files\Ollama\ollama.exe",
+                r"C:\Program Files (x86)\Ollama\ollama.exe",
+            ]
+            for path in possible_paths:
+                if os.path.exists(path):
+                    cmd = [path, "serve"]
+                    break
+    try:
+        if os.name == 'nt':
+            # Windows: CREATE_NO_WINDOW flag prevents a cmd popup
+            subprocess.Popen(
+                cmd,
+                creationflags=subprocess.CREATE_NO_WINDOW,
+                stdout=subprocess.DEVNULL,
+                stderr=subprocess.DEVNULL,
+            )
+        else:
+            # Linux/macOS: redirect output to /dev/null, no terminal emulator needed
+            subprocess.Popen(
+                cmd,
+                stdout=subprocess.DEVNULL,
+                stderr=subprocess.DEVNULL,
+            )
+    except FileNotFoundError:
+        # ollama binary not found in PATH or disk
+        return False
     for _ in range(30):
         if stop_flag is not None and stop_flag():
             return False
@@ -179,7 +205,6 @@ def start_ollama(stop_flag=None):
             return True
     return False
 
-
 # ── Topic switch detection ───────────────────────────────────────────────────
 
 _STOP_WORDS = {
@@ -264,6 +289,46 @@ def run(self):
             self.result_signal.emit([])
 
 
+# ── Model Pull Worker ─────────────────────────────────────────────────────────
+# Required models for the chatbot to function correctly
+REQUIRED_MODELS = ["qwen2.5-coder:3b", "nomic-embed-text"]
+VISION_MODEL    = "minicpm-v"   # optional — only needed for image analysis
+
+class ModelPullWorker(QThread):
+    """
+    Downloads a single Ollama model in the background.
+    Emits:
+        progress_signal(str)  — human-readable status/percentage string
+        done_signal(bool)     — True on success, False on failure
+    """
+    progress_signal = pyqtSignal(str)
+    done_signal     = pyqtSignal(bool)
+
+    def __init__(self, model_name: str):
+        super().__init__()
+        self.model_name = model_name
+
+    def run(self):
+        try:
+            self.progress_signal.emit(f"⬇️ Downloading {self.model_name}…  0%")
+            for update in ollama.pull(self.model_name, stream=True):
+                # update is a dict with keys: status, completed, total
+                status    = update.get("status", "")
+                completed = update.get("completed", 0)
+                total     = update.get("total", 0)
+                if total and completed:
+                    pct = int((completed / total) * 100)
+                    self.progress_signal.emit(
+                        f"⬇️ Downloading {self.model_name}… {pct}%"
+                    )
+                elif status:
+                    self.progress_signal.emit(
+                        f"⬇️ {self.model_name}: {status}"
+                    )
+            self.done_signal.emit(True)
+        except Exception as e:
+            self.progress_signal.emit(f"❌ Failed to download {self.model_name}: {e}")
+            self.done_signal.emit(False)
 # ── Smart token budget ───────────────────────────────────────────────────────
 
 _COMPLEX_KEYWORDS = {
diff --git a/src/configuration/Appconfig.py b/src/configuration/Appconfig.py
index 108863b84..b7539bc8c 100644
--- a/src/configuration/Appconfig.py
+++ b/src/configuration/Appconfig.py
@@ -17,7 +17,7 @@
 #      REVISION: Thursday 29 June 2023
 # =========================================================================
 
-from PyQt5 import QtWidgets
+from PyQt6 import QtWidgets
 import os
 import json
 from configparser import ConfigParser
diff --git a/src/frontEnd/Application.py b/src/frontEnd/Application.py
index 4890f0466..0c36a844b 100644
--- a/src/frontEnd/Application.py
+++ b/src/frontEnd/Application.py
@@ -30,8 +30,8 @@
     current_dir = os.path.dirname(os.path.abspath(__file__))
     init_path = os.path.abspath(os.path.join(current_dir, "..", "..")) + os.sep
 
-from PyQt5 import QtGui, QtCore, QtWidgets
-from PyQt5.Qt import QSize
+from PyQt6 import QtGui, QtCore, QtWidgets
+
 from configuration.Appconfig import Appconfig
 from frontEnd import ProjectExplorer
 from frontEnd import Workspace
@@ -42,7 +42,7 @@
 from projManagement.Validation import Validation
 from projManagement import Worker
 from frontEnd.Chatbot import ChatbotGUI
-from PyQt5.QtCore import QTimer
+from PyQt6.QtCore import QTimer, Qsize 
 # Its our main window of application.
 
 
@@ -272,8 +272,8 @@ def initToolBar(self):
         # corner in the application window.
         self.spacer = QtWidgets.QWidget()
         self.spacer.setSizePolicy(
-            QtWidgets.QSizePolicy.Expanding,
-            QtWidgets.QSizePolicy.Expanding)
+            QtWidgets.QSizePolicy.Policy.Expanding,
+            QtWidgets.QSizePolicy.Policy.Expanding)
         self.topToolbar.addWidget(self.spacer)
         self.logo = QtWidgets.QLabel()
         self.logopic = QtGui.QPixmap(
@@ -359,7 +359,7 @@ def initToolBar(self):
         self.lefttoolbar.addAction(self.omedit)
         self.lefttoolbar.addAction(self.omoptim)
         self.lefttoolbar.addAction(self.conToeSim)
-        self.lefttoolbar.setOrientation(QtCore.Qt.Vertical)
+        self.lefttoolbar.setOrientation(QtCore.Qt.Orientation.Vertical)
         self.lefttoolbar.setIconSize(QSize(40, 40))
 
     def closeEvent(self, event):
@@ -383,11 +383,11 @@ def closeEvent(self, event):
         exit_msg = "Are you sure you want to exit the program?"
         exit_msg += " All unsaved data will be lost."
         reply = QtWidgets.QMessageBox.question(
-            self, 'Message', exit_msg, QtWidgets.QMessageBox.Yes,
-            QtWidgets.QMessageBox.No
+            self, 'Message', exit_msg, QtWidgets.QMessageBox.StandardButton.Yes,
+            QtWidgets.QMessageBox.StandardButton.No
         )
 
-        if reply == QtWidgets.QMessageBox.Yes:
+        if reply == QtWidgets.QMessageBox.StandardButton.Yes:
             for proc in self.obj_appconfig.procThread_list:
                 try:
                     proc.terminate()
@@ -417,7 +417,7 @@ def closeEvent(self, event):
             event.accept()
             self.systemTrayIcon.showMessage('Exit', 'eSim is Closed.')
 
-        elif reply == QtWidgets.QMessageBox.No:
+        elif reply == QtWidgets.QMessageBox.StandardButton.No:
             event.ignore()
 
     def new_project(self):
@@ -532,7 +532,7 @@ def plotSimulationData(self, exitCode, exitStatus):
                 self.msg.showMessage(
                     'Data could not be plotted. Please try again.'
                 )
-                self.msg.exec_()
+                self.msg.exec()
                 print("Exception Message:", str(e), traceback.format_exc())
                 self.obj_appconfig.print_error('Exception Message : '
                                                + str(e))
@@ -568,7 +568,7 @@ def open_ngspice(self):
                 self.msg.showMessage(
                     'Netlist (*.cir.out) not found.'
                 )
-                self.msg.exec_()
+                self.msg.exec()
                 return
 
             self.obj_Mainview.obj_dockarea.ngspiceEditor(
@@ -587,7 +587,7 @@ def open_ngspice(self):
                 'Please select the project first.'
                 ' You can either create new project or open existing project'
             )
-            self.msg.exec_()
+            self.msg.exec()
 
     def open_subcircuit(self):
         """
@@ -628,7 +628,7 @@ def open_nghdl(self):
                                  'Please make sure it is installed')
             self.obj_appconfig.print_error('Error while opening NGHDL. ' +
                                            'Please make sure it is installed')
-            self.msg.exec_()
+            self.msg.exec()
 
     def open_makerchip(self):
         """
@@ -684,7 +684,7 @@ def open_OMedit(self):
                     'Current project does not contain any Ngspice file. ' +
                     'Please create Ngspice file with extension .cir.out'
                 )
-                self.msg.exec_()
+                self.msg.exec()
         else:
             self.msg = QtWidgets.QErrorMessage()
             self.msg.setModal(True)
@@ -693,7 +693,7 @@ def open_OMedit(self):
                 'Please select the project first. You can either ' +
                 'create a new project or open an existing project'
             )
-            self.msg.exec_()
+            self.msg.exec()
 
     def open_OMoptim(self):
         """
@@ -726,11 +726,11 @@ def open_OMoptim(self):
                 "https://www.openmodelica.org/download/download-windows"
                 ">OpenModelica Windows</a> and install latest version.<br/>"
             )
-            self.msg.setTextFormat(QtCore.Qt.RichText)
+            self.msg.setTextFormat(QtCore.Qt.TextFormat.RichText)
             self.msg.setText(self.msgContent)
             self.msg.setWindowTitle("Error Message")
             self.obj_appconfig.print_info(self.msgContent)
-            self.msg.exec_()
+            self.msg.exec()
 
     def open_conToeSim(self):
         print("Function : Schematics converter")
@@ -783,7 +783,7 @@ def __init__(self, *args):
         self.obj_projectExplorer = ProjectExplorer.ProjectExplorer()
 
         # Adding content to vertical middle Split.
-        self.middleSplit.setOrientation(QtCore.Qt.Vertical)
+        self.middleSplit.setOrientation(QtCore.Qt.Orientation.Vertical)
         self.middleSplit.addWidget(self.obj_dockarea)
         self.middleSplit.addWidget(self.noteArea)
 
@@ -817,7 +817,7 @@ def main(args):
 
     splash_pix = QtGui.QPixmap(init_path + 'images/splash_screen_esim.png')
     splash = QtWidgets.QSplashScreen(
-        appView, splash_pix, QtCore.Qt.WindowStaysOnTopHint
+        appView, splash_pix, QtCore.Qt.WindowType.WindowStaysOnTopHint
     )
     splash.setMask(splash_pix.mask())
     splash.setDisabled(True)
@@ -842,7 +842,7 @@ def main(args):
     else:
         appView.obj_workspace.show()
 
-    sys.exit(app.exec_())
+    sys.exit(app.exec())
 
 
 # Call main function
diff --git a/src/frontEnd/Chatbot.py b/src/frontEnd/Chatbot.py
index 860aa0f2a..54bdaf3e7 100644
--- a/src/frontEnd/Chatbot.py
+++ b/src/frontEnd/Chatbot.py
@@ -19,11 +19,12 @@
 else:
     init_path = '../../'
 
-from chatbot.chatbot_thread import (  # type: ignore
+from chatbot.chatbot_thread import (
     OllamaWorker, OllamaVisionWorker, MicWorker,
     OllamaStatusWorker, ModelFetchWorker,
+    ModelPullWorker, REQUIRED_MODELS, VISION_MODEL,   
     detect_topic_switch, get_stt_backend,
-    VISION_MODEL_KEYWORDS,  # EXTRACTED: shared constant, avoids duplicate keyword list
+    VISION_MODEL_KEYWORDS,
 )
 from PyQt6.QtWidgets import (
     QWidget, QHBoxLayout, QTextBrowser, QVBoxLayout,
@@ -31,7 +32,7 @@
     QFileDialog, QDialog, QListWidget, QListWidgetItem, QFrame,
     QScrollArea, QSlider, QInputDialog
 )
-from PyQt6.QtCore import QTimer, Qt, pyqtSignal, QSize
+from PyQt6.QtCore import QTimer, Qt, pyqtSignal, QSize, QThread
 from PyQt6.QtGui import QTextCursor, QKeyEvent, QDragEnterEvent, QDropEvent
 from configuration.Appconfig import Appconfig
 from datetime import datetime
@@ -406,7 +407,7 @@ def add_to_history(self, text):
 
     def keyPressEvent(self, event: QKeyEvent):
         # ── Ctrl+V: check for clipboard image before default paste ────
-        if event.key() == Qt.Key_V and event.modifiers() & Qt.ControlModifier:
+        if event.key() == Qt.Key.Key_V and event.modifiers() & Qt.KeyboardModifier.ControlModifier:
             clipboard = QApplication.clipboard()
             mime = clipboard.mimeData()
             if mime and mime.hasImage():
@@ -428,7 +429,7 @@ def keyPressEvent(self, event: QKeyEvent):
             super().keyPressEvent(event)
             return
 
-        if event.key() == Qt.Key_Up and self._sent_history:
+        if event.key() == Qt.Key.Key_Up and self._sent_history:
             if self._hist_idx == -1:
                 self._draft = self.text()
                 self._hist_idx = len(self._sent_history) - 1
@@ -436,7 +437,7 @@ def keyPressEvent(self, event: QKeyEvent):
                 self._hist_idx -= 1
             self.setText(self._sent_history[self._hist_idx])
             self.end(False)
-        elif event.key() == Qt.Key_Down and self._hist_idx >= 0:
+        elif event.key() == Qt.Key.Key_Down and self._hist_idx >= 0:
             self._hist_idx += 1
             if self._hist_idx >= len(self._sent_history):
                 self._hist_idx = -1
@@ -564,8 +565,8 @@ def __init__(self, session: dict, parent=None):
 
 class _DeleteConfirmDialog(QDialog):
     def __init__(self, title: str, parent=None):
-        super().__init__(parent, Qt.FramelessWindowHint | Qt.Dialog)
-        self.setAttribute(Qt.WA_TranslucentBackground)
+        super().__init__(parent, Qt.WindowType.FramelessWindowHint | Qt.WindowType.Dialog)
+        self.setAttribute(Qt.WidgetAttribute.WA_TranslucentBackground)
         self.setMinimumWidth(320)
         outer = QWidget(self)
         outer.setObjectName("card")
@@ -582,7 +583,7 @@ def __init__(self, title: str, parent=None):
 
         title_lbl = QLabel("Delete chat?")
         title_lbl.setStyleSheet("font-size:16px; font-weight:bold; color:#1a1a2e;")
-        title_lbl.setAlignment(Qt.AlignCenter)
+        title_lbl.setAlignment(Qt.AlignmentFlag.AlignCenter)
         card_layout.addWidget(title_lbl)
 
         body_lbl = QLabel(
@@ -591,11 +592,11 @@ def __init__(self, title: str, parent=None):
             f'<span style="color:#999;font-size:11px;">This cannot be undone.</span></span>'
         )
         body_lbl.setWordWrap(True)
-        body_lbl.setAlignment(Qt.AlignCenter)
+        body_lbl.setAlignment(Qt.AlignmentFlag.AlignCenter)
         card_layout.addWidget(body_lbl)
 
         div = QFrame()
-        div.setFrameShape(QFrame.HLine)
+        div.setFrameShape(QFrame.Shape.HLine)
         div.setStyleSheet("color:#f0f0f0;")
         card_layout.addWidget(div)
 
@@ -656,7 +657,7 @@ def __init__(self, session_id: str, title: str, date: str,
 
         avatar = QLabel(title[0].upper() if title else "C")
         avatar.setFixedSize(38, 38)
-        avatar.setAlignment(Qt.AlignCenter)
+        avatar.setAlignment(Qt.AlignmentFlag.AlignCenter)
         avatar.setStyleSheet("""
             QLabel {
                 background: qlineargradient(
@@ -693,13 +694,13 @@ def __init__(self, session_id: str, title: str, date: str,
         meta_row.setContentsMargins(0, 0, 0, 0)
         kind_lbl = QLabel()
         kind_lbl.setText(_session_kind_badge(kind))
-        kind_lbl.setTextFormat(Qt.RichText)
+        kind_lbl.setTextFormat(Qt.TextFormat.RichText)
         kind_lbl.setStyleSheet("background:transparent;")
         meta_row.addWidget(kind_lbl)
         if msg_count > 0:
             count_lbl = QLabel(str(msg_count))
             count_lbl.setFixedSize(20, 16)
-            count_lbl.setAlignment(Qt.AlignCenter)
+            count_lbl.setAlignment(Qt.AlignmentFlag.AlignCenter)
             count_lbl.setStyleSheet("""
                 QLabel {
                     background:#0095f6; color:white;
@@ -762,7 +763,7 @@ def sizeHint(self):
 
     def _on_delete_clicked(self):
         dlg = _DeleteConfirmDialog(self.title, self)
-        if dlg.exec() == QDialog.Accepted:
+        if dlg.exec() == QDialog.DialogCode.Accepted:
             self.delete_requested.emit(self.session_id)
 
 
@@ -877,7 +878,7 @@ def __init__(self, parent=None):
         root.addWidget(controls)
 
         sep = QFrame()
-        sep.setFrameShape(QFrame.HLine)
+        sep.setFrameShape(QFrame.Shape.HLine)
         sep.setFixedHeight(1)
         sep.setStyleSheet("QFrame { background:#f0f0f0; border:none; }")
         root.addWidget(sep)
@@ -902,7 +903,7 @@ def __init__(self, parent=None):
         root.addWidget(self.session_list)
 
         self._empty_lbl = QLabel("No saved chats yet.\nStart a conversation!")
-        self._empty_lbl.setAlignment(Qt.AlignCenter)
+        self._empty_lbl.setAlignment(Qt.AlignmentFlag.AlignCenter)
         self._empty_lbl.setStyleSheet("""
             QLabel {
                 color:#ccc; font-size:12px;
@@ -957,7 +958,7 @@ def _apply_filter(self):
             preview = next((m[5:].strip() for m in msgs if m.startswith("User:")), "")
             kind = s.get('kind', 'text')
             item = QListWidgetItem()
-            item.setData(Qt.UserRole, sid)
+            item.setData(Qt.ItemDataRole.UserRole, sid)
             widget = _SessionItemWidget(sid, title, date, msg_count, preview, kind, self.session_list)
             widget.delete_requested.connect(self._delete_session)
             widget.rename_requested.connect(self.rename_requested)
@@ -1075,7 +1076,7 @@ def __init__(self):
                 border-radius:14px; padding:4px 14px;
             }
         """)
-        self._toast.setAlignment(Qt.AlignCenter)
+        self._toast.setAlignment(Qt.AlignmentFlag.AlignCenter)
         self._toast.hide()
 
         root = QHBoxLayout(self)
@@ -1128,7 +1129,6 @@ def __init__(self):
             QComboBox:focus { border:1px solid #0095f6; background:#fff; }
             QComboBox::drop-down { border:none; width:18px; }
         """)
-        self._populate_models()
         header_layout.addWidget(self.model_combo)
 
         self._refresh_models_btn = QPushButton("↻")
@@ -1205,7 +1205,7 @@ def __init__(self):
         self._update_ollama_status()
 
         header_sep = QFrame()
-        header_sep.setFrameShape(QFrame.HLine)
+        header_sep.setFrameShape(QFrame.Shape.HLine)
         header_sep.setStyleSheet("color:#ececec; margin:0;")
         chat_layout.addLayout(header_layout)
         chat_layout.addWidget(header_sep)
@@ -1264,7 +1264,8 @@ def __init__(self):
         self._temp_label = QLabel(f"Precision  {self._temperature:.2f}")
         self._temp_label.setStyleSheet("font-size:10px; color:#555;")
         temp_col.addWidget(self._temp_label)
-        self._temp_slider = QSlider(Qt.Horizontal)
+
+        self._temp_slider = QSlider(Qt.Orientation.Horizontal)
         self._temp_slider.setRange(1, 100)
         self._temp_slider.setValue(int(self._temperature * 100))
         self._temp_slider.setFixedWidth(110)
@@ -1276,7 +1277,8 @@ def __init__(self):
         self._tok_label = QLabel(f"Max tokens  {self._num_predict}")
         self._tok_label.setStyleSheet("font-size:10px; color:#555;")
         tok_col.addWidget(self._tok_label)
-        self._tok_slider = QSlider(Qt.Horizontal)
+
+        self._tok_slider = QSlider(Qt.Orientation.Horizontal)
         self._tok_slider.setRange(1, 40)
         self._tok_slider.setValue(self._num_predict // 128)
         self._tok_slider.setFixedWidth(110)
@@ -1408,8 +1410,8 @@ def __init__(self):
 
         scroll = QScrollArea()
         scroll.setFixedHeight(72)
-        scroll.setHorizontalScrollBarPolicy(Qt.ScrollBarAsNeeded)
-        scroll.setVerticalScrollBarPolicy(Qt.ScrollBarAlwaysOff)
+        scroll.setHorizontalScrollBarPolicy(Qt.ScrollBarPolicy.ScrollBarAsNeeded)
+        scroll.setVerticalScrollBarPolicy(Qt.ScrollBarPolicy.ScrollBarAlwaysOff)
         scroll.setWidgetResizable(True)
         scroll.setStyleSheet("QScrollArea { border:none; background:transparent; }")
         self._thumb_container = QWidget()
@@ -1423,6 +1425,103 @@ def __init__(self):
 
         self.move_to_bottom_right()
         self._load_history()
+        self._startup_check()
+        # ── Startup: headless server + auto-pull ─────────────────────────────
+
+    def _startup_check(self):
+        """
+        Called once on startup.
+        1. If Ollama is not running, start it headlessly.
+        2. Check which required models are missing.
+        3. Pull each missing model one-by-one with live progress.
+        """
+        from chatbot.chatbot_thread import is_ollama_running, start_ollama
+
+        self.user_input.setEnabled(False)
+        self.send_button.setEnabled(False)
+        self.status_label.setText("🔄 Starting Ollama server…")
+
+        if not is_ollama_running():
+            self.status_label.setText("🔄 Starting Ollama in background…")
+            # start_ollama blocks for up to 30s waiting for the server
+            # Run it in a thread so the UI does not freeze
+            self._ollama_start_worker = OllamaStatusWorker()
+            self._ollama_start_worker.result_signal.connect(self._on_server_ready)
+            # Reuse OllamaStatusWorker just to trigger a background start
+            QTimer.singleShot(0, lambda: self._boot_server_then_check())
+        else:
+            self._check_and_pull_models()
+
+    def _boot_server_then_check(self):
+        """Run start_ollama() in a background thread, then check models."""
+        from chatbot.chatbot_thread import start_ollama
+
+        class _BootWorker(QThread):
+            result_ready = pyqtSignal(bool)
+            def run(self):
+                self.result_ready.emit(start_ollama())
+
+        self._boot_worker = _BootWorker()
+        self._boot_worker.result_ready.connect(self._on_server_ready)
+        self._boot_worker.start()
+
+    def _on_server_ready(self, success: bool):
+        if success:
+            self.status_label.setText("✅ Ollama server is running.")
+            self._check_and_pull_models()
+        else:
+            self.status_label.setText(
+                "❌ Could not start Ollama. "
+                "Please install it from https://ollama.com and restart eSim."
+            )
+            # Leave input disabled
+
+    def _check_and_pull_models(self):
+        """Check installed models and pull anything that is missing."""
+        from chatbot.chatbot_thread import _fetch_model_names
+        try:
+            installed = _fetch_model_names()
+        except Exception:
+            installed = []
+
+        installed_lower = [m.lower() for m in installed]
+        missing = [
+            m for m in REQUIRED_MODELS
+            if not any(m.lower() in i for i in installed_lower)
+        ]
+
+        if not missing:
+            self.status_label.setText("✅ All models ready!")
+            self.user_input.setEnabled(True)
+            self.send_button.setEnabled(True)
+            self._update_ollama_status()
+            return
+
+        # Pull missing models one by one
+        self._pull_queue = missing
+        self._pull_next_model()
+
+    def _pull_next_model(self):
+        if not self._pull_queue:
+            self.status_label.setText("✅ All models downloaded and ready!")
+            self.user_input.setEnabled(True)
+            self.send_button.setEnabled(True)
+            self._populate_models()
+            return
+
+        model = self._pull_queue.pop(0)
+        self.status_label.setText(f"⬇️ Downloading {model}… 0%")
+        self._pull_worker = ModelPullWorker(model)
+        self._pull_worker.progress_signal.connect(self.status_label.setText)
+        self._pull_worker.done_signal.connect(self._on_model_pulled)
+        self._pull_worker.start()
+
+    def _on_model_pulled(self, success: bool):
+        if success:
+            self._pull_next_model()   # pull the next one in the queue
+        else:
+            # Failed but continue trying the rest
+            self._pull_next_model()
 
     # ── Streaming helpers ─────────────────────────────────────────────
 
@@ -1475,7 +1574,7 @@ def _begin_streaming_bubble(self):
         self._stream_ts = _get_time()
         self._stream_idx = self._response_counter
         cursor = QTextCursor(self.chat_display.document())
-        cursor.movePosition(QTextCursor.End)
+        cursor.movePosition(QTextCursor.MoveOperation.End)
         cursor.insertHtml(
             self._STREAM_ANCHOR
             + _bot_bubble("…", self._stream_ts, self._stream_idx)
@@ -1500,7 +1599,7 @@ def _on_stream_chunk(self, piece: str):
                 return
 
         # Select from anchor to end of document and rewrite the bubble in place.
-        anchor_cursor.movePosition(QTextCursor.End, QTextCursor.KeepAnchor)
+        anchor_cursor.movePosition(QTextCursor.MoveOperation.End, QTextCursor.MoveMode.KeepAnchor)
         anchor_cursor.removeSelectedText()
         anchor_cursor.insertHtml(
             self._STREAM_ANCHOR
@@ -1561,7 +1660,7 @@ def _refresh_sidebar_if_open(self):
 
     def _delete_all_chats(self):
         dlg = _DeleteConfirmDialog("all chats", self)
-        if dlg.exec() != QDialog.Accepted:
+        if dlg.exec() != QDialog.DialogCode.Accepted:
             return
         try:
             if os.path.exists(_SESSIONS_DIR):
@@ -1585,7 +1684,7 @@ def _delete_all_chats(self):
         self._sidebar.populate()
 
     def _open_session_viewer(self, item):
-        session_id = item.data(Qt.UserRole)
+        session_id = item.data(Qt.ItemDataRole.UserRole)
         path = os.path.join(_SESSIONS_DIR, f"{session_id}.json")
         try:
             with open(path, encoding='utf-8') as f:
@@ -1659,6 +1758,8 @@ def _rebuild_chat_html_from_history(self):
 
     def _on_session_clicked(self, item):
         session_id = item.data(Qt.UserRole)
+
+        # If this is the session already showing, do nothing.
         if (session_id == self._current_session_id
                 and not self._viewing_past_session):
             return
@@ -1939,7 +2040,9 @@ def _on_status_result(self, running: bool):
     def _show_typing_bubble(self):
         self._typing_frame = 0
         cursor = QTextCursor(self.chat_display.document())
-        cursor.movePosition(QTextCursor.End)
+        cursor.movePosition(QTextCursor.MoveOperation.End)
+        # Insert sentinel anchor + bubble in one operation so they form
+        # a contiguous block that can be fully removed later.
         cursor.insertHtml(self._TYPING_ANCHOR + _typing_bubble(0))
         self._scroll_to_bottom()
         self._typing_anim_timer.start(400)
@@ -1950,7 +2053,10 @@ def _animate_typing_bubble(self):
         if anchor_cursor is None:
             self._typing_anim_timer.stop()
             return
-        anchor_cursor.movePosition(QTextCursor.End, QTextCursor.KeepAnchor)
+        # Select from the sentinel to the end of the document and replace.
+        # This is immune to any reflow that happened while the window was
+        # in the background because we locate by anchor name, not position.
+        anchor_cursor.movePosition(QTextCursor.MoveOperation.End, QTextCursor.MoveMode.KeepAnchor)
         anchor_cursor.insertHtml(self._TYPING_ANCHOR + _typing_bubble(self._typing_frame))
         sb = self.chat_display.verticalScrollBar()
         if sb.maximum() - sb.value() < 60:
@@ -1960,7 +2066,7 @@ def _remove_typing_bubble(self):
         self._typing_anim_timer.stop()
         anchor_cursor = self._find_typing_anchor_cursor()
         if anchor_cursor is not None:
-            anchor_cursor.movePosition(QTextCursor.End, QTextCursor.KeepAnchor)
+            anchor_cursor.movePosition(QTextCursor.MoveOperation.End, QTextCursor.MoveMode.KeepAnchor)
             anchor_cursor.removeSelectedText()
         self._typing_start_pos = -1
 
@@ -2056,7 +2162,7 @@ def _make_thumbnail(self, image_path: str) -> QWidget:
         card_layout.setSpacing(2)
 
         thumb_lbl = QLabel()
-        thumb_lbl.setAlignment(Qt.AlignCenter)
+        thumb_lbl.setAlignment(Qt.AlignmentFlag.AlignCenter)
         thumb_lbl.setFixedHeight(36)
         pix = QPixmap(image_path)
         if not pix.isNull():
@@ -2073,7 +2179,7 @@ def _make_thumbnail(self, image_path: str) -> QWidget:
 
         fname = os.path.basename(image_path)
         name_lbl = QLabel(fname[:10] + ("…" if len(fname) > 10 else ""))
-        name_lbl.setAlignment(Qt.AlignCenter)
+        name_lbl.setAlignment(Qt.AlignmentFlag.AlignCenter)
         name_lbl.setStyleSheet("font-size:9px;color:#555;background:transparent;")
         card_layout.addWidget(name_lbl)
 
@@ -2419,15 +2525,18 @@ def _populate_models(self):
 
     def _on_models_fetched(self, model_names: list):
         self.model_combo.clear()
+        from chatbot.chatbot_thread import is_ollama_running
 
         if not model_names:
-            # No models found — Ollama may be offline or has no models pulled.
             self.model_combo.addItem("No models found")
             self.model_combo.setEnabled(False)
-            self.status_label.setText(
-                "⚠️ No Ollama models found. Run 'ollama pull qwen2.5-coder' "
-                "in a terminal to install one."
-            )
+            if is_ollama_running():
+                self.status_label.setText(
+                    "⚠️ No Ollama models found. Run 'ollama pull qwen2.5-coder:3b' "
+                    "in a terminal to install one."
+                )
+            else:
+                self.status_label.setText("🔴 Ollama is offline.")
             return
 
         for name in model_names:
@@ -2742,7 +2851,7 @@ def display_response(self, bot_response):
             idx = self._stream_idx
             anchor_cursor = self._find_stream_anchor_cursor()
             if anchor_cursor is not None:
-                anchor_cursor.movePosition(QTextCursor.End, QTextCursor.KeepAnchor)
+                anchor_cursor.movePosition(QTextCursor.MoveOperation.End, QTextCursor.MoveMode.KeepAnchor)
                 anchor_cursor.removeSelectedText()
                 anchor_cursor.insertHtml(_bot_bubble(bot_response, ts, idx))
             else:
diff --git a/src/frontEnd/DockArea.py b/src/frontEnd/DockArea.py
index a63c87379..9a0fe6b40 100755
--- a/src/frontEnd/DockArea.py
+++ b/src/frontEnd/DockArea.py
@@ -1,4 +1,4 @@
-from PyQt5 import QtCore, QtWidgets
+from PyQt6 import QtCore, QtWidgets
 from ngspiceSimulation import plotWindow
 from ngspiceSimulation.NgspiceWidget import NgspiceWidget
 from configuration.Appconfig import Appconfig
@@ -9,8 +9,9 @@
 from browser.Welcome import Welcome
 from browser.UserManual import UserManual
 from ngspicetoModelica.ModelicaUI import OpenModelicaEditor
-from PyQt5.QtWidgets import QLineEdit, QLabel, QPushButton, QVBoxLayout, QHBoxLayout
-from PyQt5.QtCore import Qt
+from PyQt6.QtWidgets import (
+    QLineEdit, QLabel, QPushButton, QVBoxLayout, QHBoxLayout)
+from PyQt6.QtCore import Qt
 import os
 from converter.pspiceToKicad import PspiceConverter
 from converter.ltspiceToKicad import LTspiceConverter
@@ -220,7 +221,7 @@ def eSimConverter(self):
         file_path_text_box = QLineEdit()
         file_path_text_box.setFixedHeight(30)
         file_path_text_box.setFixedWidth(800)
-        file_path_layout.setAlignment(Qt.AlignCenter)
+        file_path_layout.setAlignment(Qt.AlignmentFlag.AlignCenter)
         file_path_layout.addWidget(file_path_text_box)
 
         browse_button = QPushButton("Browse")
@@ -264,7 +265,7 @@ def eSimConverter(self):
         # lib_path_text_box = QLineEdit()
         # lib_path_text_box.setFixedHeight(30)
         # lib_path_text_box.setFixedWidth(800)
-        # lib_path_layout.setAlignment(Qt.AlignCenter)
+        # lib_path_layout.setAlignment(Qt.AlignmentFlag.AlignCenter)
         # lib_path_layout.addWidget(lib_path_text_box)
 
         # browse_button1 = QPushButton("Browse lib")
@@ -316,7 +317,7 @@ def eSimConverter(self):
         self.description_label = QLabel()
         self.description_label.setFixedHeight(160)
         self.description_label.setFixedWidth(950)
-        self.description_label.setAlignment(Qt.AlignBottom)
+        self.description_label.setAlignment(Qt.AlignmentFlag.AlignBottom)
         self.description_label.setWordWrap(True)
         self.description_label.setText(description_html)
         self.eConLayout.addWidget(self.description_label)  # Add the description label to the layout
@@ -356,7 +357,7 @@ def modelEditor(self):
                 'Please select the project first.'
                 ' You can either create new project or open existing project'
             )
-            self.msg.exec_()
+            self.msg.exec()
             return
         projName = os.path.basename(projDir)
         dockName = f'Model Editor-{projName}-'
@@ -483,7 +484,7 @@ def subcircuiteditor(self):
                 'Please select the project first.'
                 ' You can either create new project or open existing project'
             )
-            self.msg.exec_()
+            self.msg.exec()
 
     def makerchip(self):
         """This function creates a widget for different subcircuit options."""
@@ -500,7 +501,7 @@ def makerchip(self):
                 'Please select the project first.'
                 ' You can either create new project or open existing project'
             )
-            self.msg.exec_()
+            self.msg.exec()
             return
         projName = os.path.basename(projDir)
         dockName = f'Makerchip-{projName}-'
diff --git a/src/frontEnd/ProjectExplorer.py b/src/frontEnd/ProjectExplorer.py
index bc55dac9c..1056e0bd4 100755
--- a/src/frontEnd/ProjectExplorer.py
+++ b/src/frontEnd/ProjectExplorer.py
@@ -1,5 +1,5 @@
-from PyQt5 import QtCore, QtWidgets
-from PyQt5.QtWidgets import QDockWidget, QMessageBox,QMenu 
+from PyQt6 import QtCore, QtWidgets
+from PyQt6.QtWidgets import QDockWidget, QMessageBox,QMenu 
 import os
 import json
 from configuration.Appconfig import Appconfig
@@ -70,7 +70,7 @@ def __init__(self):
         self.window.addWidget(self.treewidget)
         self.treewidget.expanded.connect(self.refreshInstant)
         self.treewidget.doubleClicked.connect(self.openProject)
-        self.treewidget.setContextMenuPolicy(QtCore.Qt.CustomContextMenu)
+        self.treewidget.setContextMenuPolicy(QtCore.Qt.ContextMenuPolicy.CustomContextMenu)
         self.treewidget.customContextMenuRequested.connect(self.openMenu)
         self.setLayout(self.window)
         self.show()
@@ -143,7 +143,7 @@ def openMenu(self, position):
         refresh_action = menu.addAction("Refresh")
         refresh_action.triggered.connect(self.refreshInstant)
 
-        menu.exec_(self.treewidget.viewport().mapToGlobal(position))
+        menu.exec(self.treewidget.viewport().mapToGlobal(position))
 
     def openProject(self):
         self.indexItem = self.treewidget.currentIndex()
@@ -273,7 +273,7 @@ def refreshProject(self, filePath=None, indexItem=None):
             msg.setModal(True)
             msg.setWindowTitle("Error Message")
             msg.showMessage('Selected project does not exist.')
-            msg.exec_()
+            msg.exec()
             return False
 
     def renameProject(self):
@@ -309,7 +309,7 @@ def renameProject(self):
                 msg.setModal(True)
                 msg.setWindowTitle("Error Message")
                 msg.showMessage('The project name cannot be empty')
-                msg.exec_()
+                msg.exec()
 
             elif self.baseFileName == newBaseFileName:
                 print("Project name has to be different")
@@ -318,7 +318,7 @@ def renameProject(self):
                 msg.setModal(True)
                 msg.setWindowTitle("Error Message")
                 msg.showMessage('The project name has to be different')
-                msg.exec_()
+                msg.exec()
 
             elif self.refreshProject(filePath):
 
@@ -348,7 +348,7 @@ def renameProject(self):
                     msg.setModal(True)
                     msg.setWindowTitle("Error Message")
                     msg.showMessage('Selected project does not exist.')
-                    msg.exec_()
+                    msg.exec()
 
                 elif reply == "VALID":
                     # rename project folder
@@ -367,7 +367,7 @@ def renameProject(self):
                         msg.setModal(True)
                         msg.setWindowTitle("Error Message")
                         msg.showMessage(str(e))
-                        msg.exec_()
+                        msg.exec()
                         return
 
                     # rename files matching project name
@@ -406,7 +406,7 @@ def renameProject(self):
                         msg.setModal(True)
                         msg.setWindowTitle("Error Message")
                         msg.showMessage(str(e))
-                        msg.exec_()
+                        msg.exec()
                         return
 
                     # update project_explorer dictionary
@@ -436,7 +436,7 @@ def renameProject(self):
                         '" already exist. Please select a different name or' +
                         ' delete existing project'
                     )
-                    msg.exec_()
+                    msg.exec()
 
                 elif reply == "CHECKNAME":
                     print("Name can not contain space between them")
@@ -448,7 +448,7 @@ def renameProject(self):
                         'The project name should not ' +
                         'contain space between them'
                     )
-                    msg.exec_()
+                    msg.exec()
 
     def _analyze_netlist_in_copilot(self, netlist_path: str):
         """Send selected .cir file to chatbot for analysis."""
diff --git a/src/frontEnd/Workspace.py b/src/frontEnd/Workspace.py
index b6ebdd53a..d41c289ac 100755
--- a/src/frontEnd/Workspace.py
+++ b/src/frontEnd/Workspace.py
@@ -16,7 +16,7 @@
 #      REVISION: Sunday 13 December 2020
 # =========================================================================
 
-from PyQt5 import QtCore, QtGui, QtWidgets
+from PyQt6 import QtCore, QtGui, QtWidgets
 from configuration.Appconfig import Appconfig
 import time
 import os
@@ -45,7 +45,7 @@ def initWorkspace(self):
 
         self.mainwindow = QtWidgets.QVBoxLayout()
         self.split = QtWidgets.QSplitter()
-        self.split.setOrientation(QtCore.Qt.Vertical)
+        self.split.setOrientation(QtCore.Qt.Orientation.Vertical)
 
         self.grid = QtWidgets.QGridLayout()
         self.note = QtWidgets.QTextEdit(self)
@@ -81,7 +81,7 @@ def initWorkspace(self):
         self.setGeometry(QtCore.QRect(500, 250, 400, 400))
         self.setMaximumSize(4000, 200)
         self.setWindowTitle("eSim")
-        self.setWindowFlags(QtCore.Qt.WindowStaysOnTopHint)
+        self.setWindowFlags(QtCore.Qt.WindowType.WindowStaysOnTopHint)
         self.setWindowModality(2)
 
         init_path = '../../'
diff --git a/src/run_chatbot.py b/src/run_chatbot.py
new file mode 100644
index 000000000..e3f0cdf2f
--- /dev/null
+++ b/src/run_chatbot.py
@@ -0,0 +1,15 @@
+import sys
+sys.path.insert(0, '.')
+
+from PyQt6.QtWidgets import QApplication
+from PyQt6.QtCore import Qt
+
+app = QApplication(sys.argv)
+
+from frontEnd.Chatbot import ChatbotGUI
+window = ChatbotGUI()
+window.setWindowTitle("eSim AI Chatbot - Test")
+window.resize(900, 700)
+window.show()
+
+sys.exit(app.exec())
\ No newline at end of file