diff --git a/src-python/models/transcription/transcription_whisper.py b/src-python/models/transcription/transcription_whisper.py
index 08113b8c..971d8d71 100644
--- a/src-python/models/transcription/transcription_whisper.py
+++ b/src-python/models/transcription/transcription_whisper.py
@@ -40,6 +40,7 @@ def downloadFile(url, path, func=None):
                 if isinstance(func, Callable):
                     total_chunk += len(chunk)
                     func(total_chunk/file_size)
+                printLog(f"Downloading Whisper Model: {total_chunk/file_size:.0%}")
 
     except Exception as e:
         printLog("warning:downloadFile()", e)
diff --git a/src-python/models/translation/translation_utils.py b/src-python/models/translation/translation_utils.py
index 48e97e3a..aa6437da 100644
--- a/src-python/models/translation/translation_utils.py
+++ b/src-python/models/translation/translation_utils.py
@@ -81,9 +81,9 @@ def downloadCTranslate2Weight(root, weight_type="Small", callbackFunc=None):
                     if isinstance(callbackFunc, Callable):
                         total_chunk += len(chunk)
                         callbackFunc(total_chunk/file_size)
-                    printLog(f"Downloading {filename}: {total_chunk/file_size:.0%}")
+                    printLog(f"Downloading CTranslate Model: {total_chunk/file_size:.0%}")
 
             with ZipFile(os_path.join(tmp_path, filename)) as zf:
                 zf.extractall(path)
     except Exception as e:
-        printLog("error:downloadCTranslate2Weight()", e)
\ No newline at end of file
+        printLog("warning:downloadCTranslate2Weight()", e)
\ No newline at end of file
diff --git a/src-python/utils.py b/src-python/utils.py
index 2ff40bb8..eb991c39 100644
--- a/src-python/utils.py
+++ b/src-python/utils.py
@@ -81,7 +81,7 @@ def printLog(log:str, data:Any=None) -> None:
     response = {
         "status": 348,
         "log": log,
-        "data": data,
+        "data": str(data),
     }
 
     with open('process.log', 'a', encoding="utf-8") as f:
diff --git a/src-python/webui_controller.py b/src-python/webui_controller.py
index afef99ad..a5d257ef 100644
--- a/src-python/webui_controller.py
+++ b/src-python/webui_controller.py
@@ -1,4 +1,3 @@
-import json
 from typing import Callable, Union
 from time import sleep
 from subprocess import Popen
@@ -701,10 +700,15 @@ class DownloadCTranslate2ProgressBar:
                 }
             })
 
+def startThreadingDownloadCtranslate2Weight(callback:Callable[[float], None]) -> None:
+    th_download = Thread(target=model.downloadCTranslate2ModelWeight, args=(callback,))
+    th_download.daemon = True
+    th_download.start()
+
 def callbackDownloadCtranslate2Weight(data, action, *args, **kwargs) -> dict:
     printLog("Download CTranslate2 Weight")
     download = DownloadCTranslate2ProgressBar(action)
-    model.downloadCTranslate2ModelWeight(download.set)
+    startThreadingDownloadCtranslate2Weight(download.set)
     return {"status":200}
 
 def callbackSetDeeplAuthKey(data, *args, **kwargs) -> dict:
@@ -1034,10 +1038,15 @@ class DownloadWhisperProgressBar:
                 }
             })
 
+def startThreadingDownloadWhisperWeight(callback:Callable[[float], None]) -> None:
+    th_download = Thread(target=model.downloadWhisperModelWeight, args=(callback,))
+    th_download.daemon = True
+    th_download.start()
+
 def callbackDownloadWhisperWeight(data, action, *args, **kwargs) -> dict:
     printLog("Download Whisper Weight")
-    download = DownloadCTranslate2ProgressBar(action)
-    model.downloadWhisperModelWeight(download.set)
+    download = DownloadWhisperProgressBar(action)
+    startThreadingDownloadWhisperWeight(download.set)
     return {"status":200}
 
 # VR Tab
@@ -1283,8 +1292,7 @@ def init(endpoints:dict, *args, **kwargs) -> None:
     if config.USE_TRANSLATION_FEATURE is True and model.checkCTranslatorCTranslate2ModelWeight() is False:
         def callback(progress):
             printResponse(200, endpoints["ctranslate2"], {"progress":progress})
-        printLog("Download CTranslate2 Model Weight")
-        model.downloadCTranslate2ModelWeight(callback)
+        startThreadingDownloadCtranslate2Weight(callback)
 
     # set Transcription Engine
     printLog("Set Transcription Engine")
@@ -1298,7 +1306,7 @@ def init(endpoints:dict, *args, **kwargs) -> None:
     if config.USE_WHISPER_FEATURE is True and model.checkTranscriptionWhisperModelWeight() is False:
         def callback(progress):
             printResponse(200, endpoints["whisper"], {"progress":progress})
-        model.downloadWhisperModelWeight(callback)
+        startThreadingDownloadWhisperWeight(callback)
 
     # set word filter
     printLog("Set Word Filter")
diff --git a/src-python/webui_mainloop.py b/src-python/webui_mainloop.py
index 3eb3f567..0450fd0d 100644
--- a/src-python/webui_mainloop.py
+++ b/src-python/webui_mainloop.py
@@ -297,8 +297,8 @@ def main():
 
 if __name__ == "__main__":
     controller.init({
-        "ctranslate2": action_mapping["/controller/callback_download_ctranslate2_weight"]["download"],
-        "whisper": action_mapping["/controller/callback_download_whisper_weight"]["download"],
+        "ctranslate2": action_mapping["/controller/callback_download_ctranslate2_weight"],
+        "whisper": action_mapping["/controller/callback_download_whisper_weight"],
     })
 
     process = "main"