diff --git a/utils/update_check.py b/utils/update_check.py
index c5eac1a..61ec5f2 100644
--- a/utils/update_check.py
+++ b/utils/update_check.py
@@ -106,7 +106,7 @@ def download_asset(
     if not expected:
         raise ValueError("The release asset has no valid SHA-256 checksum")
 
-    fd, name = tempfile.mkstemp(dir=str(dest_dir), suffix=suffix)
+    fd, name = tempfile.mkstemp(dir=str(dest_dir), suffix=suffix, prefix="TgWsProxy_tmp_")
     path = Path(name)
     try:
         sha = hashlib.sha256()
diff --git a/windows.py b/windows.py
index 0725fb5..bf2eaee 100644
--- a/windows.py
+++ b/windows.py
@@ -148,7 +148,7 @@ def update_ctk_form(
             width=310 if asset else 210,
             height=130 if asset else 100,
             theme=theme,
-            topmost=False,
+            topmost=True,
             after_create=lambda r: r.iconbitmap(ICON_PATH),
         )
         frame = main_content_frame(ctk, root, theme, padx=16, pady=14)