fix startupinfo

katrain/core/engine.py

@@ -85,8 +85,10 @@ class KataGoEngine:
     def start(self):
         try:
             self.katrain.log(f"Starting KataGo with {self.command}", OUTPUT_DEBUG)
-            startupinfo = subprocess.STARTUPINFO()
-            startupinfo.dwFlags |= subprocess.STARTF_USESHOWWINDOW
+            startupinfo = None # stop command box popups on windows/pyinstaller
+            if hasattr(subprocess, "STARTUPINFO"):
+                startupinfo = subprocess.STARTUPINFO()
+                startupinfo.dwFlags |= subprocess.STARTF_USESHOWWINDOW
             self.katago_process = subprocess.Popen(
                 self.command,
                 startupinfo=startupinfo,