diff --git a/__init__.py b/__init__.py
index 1123410b..142d92a9 100644
--- a/__init__.py
+++ b/__init__.py
@@ -33,7 +33,7 @@ sys.path.append('../..')
 from torchvision.datasets.utils import download_url
 
 # ensure .js
-print("### Loading: ComfyUI-Manager (V0.21.2)")
+print("### Loading: ComfyUI-Manager (V0.21.3)")
 
 comfy_ui_required_revision = 1240
 comfy_ui_revision = "Unknown"
diff --git a/prestartup_script.py b/prestartup_script.py
index 763efbd5..4e411392 100644
--- a/prestartup_script.py
+++ b/prestartup_script.py
@@ -1,10 +1,9 @@
 import datetime
 import os
 import subprocess
-
 import sys
-import os
 import atexit
+import threading
 
 # Logger setup
 if os.path.exists("comfyui.log"):
@@ -15,7 +14,6 @@ if os.path.exists("comfyui.log"):
 original_stdout = sys.stdout
 original_stderr = sys.stderr
 
-
 class Logger:
     def __init__(self, filename):
         self.file = open(filename, "a")
@@ -34,6 +32,11 @@ class Logger:
         self.file.close()
 
 
+def handle_stream(stream, prefix):
+    for line in stream:
+        print(prefix, line, end="")
+
+
 sys.stdout = Logger("comfyui.log")
 sys.stderr = sys.stdout
 
@@ -61,12 +64,23 @@ if os.path.exists(script_list_path):
 
             try:
                 script = eval(line)
-                print(f"\n## ComfyUI-Manager: EXECUTE => {script}")
+                print(f"\n## ComfyUI-Manager: EXECUTE => {script[1:]}")
 
                 print(f"\n## Execute install/(de)activation script for '{script[0]}'")
-                code = subprocess.run(script[1:], cwd=script[0])
+                process = subprocess.Popen(script[1:], cwd=script[0], stdout=subprocess.PIPE, stderr=subprocess.PIPE, text=True, bufsize=1)
 
-                if code.returncode != 0:
+                stdout_thread = threading.Thread(target=handle_stream, args=(process.stdout, ""))
+                stderr_thread = threading.Thread(target=handle_stream, args=(process.stderr, "[!]"))
+
+                stdout_thread.start()
+                stderr_thread.start()
+
+                stdout_thread.join()
+                stderr_thread.join()
+
+                exit_code = process.wait()
+
+                if exit_code != 0:
                     print(f"install/(de)activation script failed: {script[0]}")
             except Exception as e:
                 print(f"[ERROR] Failed to execute install/(de)activation script: {line} / {e}")