diff --git a/src-python/config.py b/src-python/config.py
index a7a8e747..52fa5f07 100644
--- a/src-python/config.py
+++ b/src-python/config.py
@@ -923,8 +923,8 @@ class Config:
         self._TEXTBOX_UI_SCALING_RANGE = (40, 200)
         self._MESSAGE_BOX_RATIO_RANGE = (1, 99)
         self._SELECTABLE_CTRANSLATE2_WEIGHT_TYPE_DICT = {
-            "Small": False,
-            "Large": False,
+            "small": False,
+            "large": False,
         }
 
         self._SELECTABLE_WHISPER_WEIGHT_TYPE_DICT = {
@@ -1071,7 +1071,7 @@ class Config:
         self._USE_EXCLUDE_WORDS = True
         self._SELECTED_TRANSLATION_COMPUTE_DEVICE = {"device": "cpu", "device_index": 0, "device_name":"cpu"}
         self._SELECTED_TRANSCRIPTION_COMPUTE_DEVICE = {"device": "cpu", "device_index": 0, "device_name":"cpu"}
-        self._CTRANSLATE2_WEIGHT_TYPE = "Small"
+        self._CTRANSLATE2_WEIGHT_TYPE = "small"
         self._WHISPER_WEIGHT_TYPE = "base"
         self._SEND_MESSAGE_FORMAT = "[message]"
         self._SEND_MESSAGE_FORMAT_WITH_T = "[message]([translation])"
diff --git a/src-python/models/transcription/transcription_whisper.py b/src-python/models/transcription/transcription_whisper.py
index d21df91a..049af84a 100644
--- a/src-python/models/transcription/transcription_whisper.py
+++ b/src-python/models/transcription/transcription_whisper.py
@@ -70,7 +70,7 @@ def downloadWhisperWeight(root, weight_type, callback=None, end_callback=None):
         for filename in _FILENAMES:
             file_path = os_path.join(path, filename)
             url = huggingface_hub.hf_hub_url(_MODELS[weight_type], filename)
-            downloadFile(url, file_path, func=callback)
+            downloadFile(url, file_path, func=callback if filename == "model.bin" else None)
     if isinstance(end_callback, Callable):
         end_callback()
 
diff --git a/src-python/models/translation/translation_utils.py b/src-python/models/translation/translation_utils.py
index dbe06e76..f6312884 100644
--- a/src-python/models/translation/translation_utils.py
+++ b/src-python/models/translation/translation_utils.py
@@ -8,7 +8,7 @@ import hashlib
 from utils import printLog
 
 ctranslate2_weights = {
-    "Small": { # M2M-100 418M-parameter model
+    "small": { # M2M-100 418M-parameter model
         "url": "https://github.com/misyaguziya/VRCT-weights/releases/download/v1.0/m2m100_418m.zip",
         "directory_name": "m2m100_418m",
         "tokenizer": "facebook/m2m100_418M",
@@ -18,7 +18,7 @@ ctranslate2_weights = {
             "shared_vocabulary.txt": "bd440aa21b8ca3453fc792a0018a1f3fe68b3464aadddd4d16a4b72f73c86d8c",
         }
     },
-    "Large": { # M2M-100 1.2B-parameter model
+    "large": { # M2M-100 1.2B-parameter model
         "url": "https://github.com/misyaguziya/VRCT-weights/releases/download/v1.0/m2m100_12b.zip",
         "directory_name": "m2m100_12b",
         "tokenizer": "facebook/m2m100_1.2b",
@@ -39,7 +39,7 @@ def calculate_file_hash(file_path, block_size=65536):
 
     return hash_object.hexdigest()
 
-def checkCTranslate2Weight(root, weight_type="Small"):
+def checkCTranslate2Weight(root, weight_type="small"):
     weight_directory_name = ctranslate2_weights[weight_type]["directory_name"]
     hash_data = ctranslate2_weights[weight_type]["hash"]
     files = [
@@ -61,7 +61,7 @@ def checkCTranslate2Weight(root, weight_type="Small"):
         already_downloaded = True
     return already_downloaded
 
-def downloadCTranslate2Weight(root, weight_type="Small", callback=None, end_callback=None):
+def downloadCTranslate2Weight(root, weight_type="small", callback=None, end_callback=None):
     url = ctranslate2_weights[weight_type]["url"]
     filename = "weight.zip"
     path = os_path.join(root, "weights", "ctranslate2")
diff --git a/src-python/webui_mainloop.py b/src-python/webui_mainloop.py
index baddba4c..a3deffcd 100644
--- a/src-python/webui_mainloop.py
+++ b/src-python/webui_mainloop.py
@@ -512,7 +512,7 @@ if __name__ == "__main__":
                     case "/set/data/ui_language":
                         data = "ja"
                     case "/set/data/ctranslate2_weight_type":
-                        data = "Small"
+                        data = "small"
                     case "/set/data/deepl_auth_key":
                         data = "aaaaaaaa-bbbb-cccc-dddd-eeeeeeeeeeee:fx"
                     case "/set/data/selected_mic_host":