diff --git a/main.py b/main.py
index c79f397..ead9613 100644
--- a/main.py
+++ b/main.py
@@ -72,6 +72,8 @@ class DownloadThread(QThread):
         self.cmd_args = cmd_args
         self.use_local_ytdlp = use_local_ytdlp
         self.output_filename = output_filename
+        self.process = None
+        self.abort = False
 
     def run(self):
         try:
@@ -144,7 +146,7 @@ class DownloadThread(QThread):
             
             # Unterdrücke das CMD-Fenster unter Windows
             creationflags = subprocess.CREATE_NO_WINDOW if os.name == 'nt' else 0
-            process = subprocess.Popen(
+            self.process = subprocess.Popen(
                 cmd,
                 stdout=subprocess.PIPE,
                 stderr=subprocess.STDOUT,
@@ -154,19 +156,34 @@ class DownloadThread(QThread):
                 creationflags=creationflags
             )
             
-            for line in process.stdout:
+            for line in self.process.stdout:
+                if self.abort:
+                    self.process.terminate()
+                    self.update_signal.emit("Download abgebrochen.")
+                    self.finished_signal.emit(False, "Download wurde abgebrochen.")
+                    return
                 self.update_signal.emit(line.strip())
             
-            process.wait()
+            self.process.wait()
             
-            if process.returncode == 0:
+            if self.abort:
+                self.finished_signal.emit(False, "Download wurde abgebrochen.")
+            elif self.process.returncode == 0:
                 self.finished_signal.emit(True, "Download erfolgreich abgeschlossen!")
             else:
-                self.finished_signal.emit(False, f"Download fehlgeschlagen mit Exitcode {process.returncode}")
+                self.finished_signal.emit(False, f"Download fehlgeschlagen mit Exitcode {self.process.returncode}")
                 
         except Exception as e:
             self.update_signal.emit(f"Fehler: {str(e)}")
             self.finished_signal.emit(False, f"Fehler: {str(e)}")
+            
+    def stop(self):
+        self.abort = True
+        if self.process:
+            try:
+                self.update_signal.emit("Versuche Download zu beenden...")
+            except:
+                pass
 
 
 class PresetDialog(QDialog):
@@ -974,6 +991,11 @@ class MainWindow(QMainWindow):
         self.cmd_preview.setText(" ".join(formatted_cmd))
     
     def start_download(self):
+        # Wenn bereits ein Download läuft und der Button als "Abbrechen" angezeigt wird
+        if self.download_thread and self.download_thread.isRunning():
+            self.abort_download()
+            return
+            
         url = self.url_input.text()
         if not url:
             QMessageBox.warning(self, "Fehler", "Bitte geben Sie eine URL ein.")
@@ -1043,9 +1065,37 @@ class MainWindow(QMainWindow):
         )
         self.download_thread.update_signal.connect(self.update_log)
         self.download_thread.finished_signal.connect(self.download_finished)
-        self.download_btn.setEnabled(False)
+        
+        # Ändere den Button-Text und deaktiviere UI-Elemente während des Downloads
+        self.download_btn.setText("Download abbrechen")
+        self.disable_ui_during_download(True)
+        
         self.download_thread.start()
     
+    def abort_download(self):
+        """Bricht den aktuellen Download ab."""
+        if self.download_thread and self.download_thread.isRunning():
+            self.log_output.append("Abbruch angefordert...")
+            self.download_thread.stop()
+            # Button wird in download_finished wieder auf "Download starten" gesetzt
+    
+    def disable_ui_during_download(self, disable=True):
+        """Deaktiviert/aktiviert UI-Elemente während des Downloads."""
+        self.url_input.setReadOnly(disable)
+        self.preset_combo.setEnabled(not disable)
+        self.add_preset_btn.setEnabled(not disable)
+        self.edit_preset_btn.setEnabled(not disable)
+        self.delete_preset_btn.setEnabled(not disable)
+        self.optionen_btn.setEnabled(not disable)
+        if hasattr(self, 'series_input'):
+            self.series_input.setReadOnly(disable)
+        if hasattr(self, 'season_input'):
+            self.season_input.setReadOnly(disable)
+        if hasattr(self, 'episode_input'):
+            self.episode_input.setReadOnly(disable)
+        if hasattr(self, 'custom_path_input'):
+            self.custom_path_input.setReadOnly(disable)
+    
     def update_log(self, text):
         self.log_output.append(text)
         # Scroll zum Ende
@@ -1053,7 +1103,10 @@ class MainWindow(QMainWindow):
         scrollbar.setValue(scrollbar.maximum())
     
     def download_finished(self, success, message):
-        self.download_btn.setEnabled(True)
+        # UI-Elemente wieder aktivieren
+        self.disable_ui_during_download(False)
+        # Button-Text zurücksetzen
+        self.download_btn.setText("Download starten")
         
         if success:
             self.log_output.append(message)