Update client.py

syncplay/client.py

@@ -1623,6 +1623,22 @@ class SyncplayUserlist(object):
 
 class UiManager(object):
     def __init__(self, client, ui):
+        def isWindows():
+            return sys.platform.startswith("win")
+        
+        def doWindowsRedistCheck():
+            import ctypes
+            try:
+                ctypes.CDLL('vcruntime140.dll')
+            except OSError:
+                ctypes.windll.user32.MessageBoxW(0, '''Syncplay relies on the Microsoft Visual C++ Redistributable which is not installed.
+                     It can be downloaded at https://aka.ms/vs/17/release/vc_redist.x86.exe
+                     For more details see http://syncplay.pl/''', "Syncplay", 1)
+            sys.exit()
+        
+        if isWindows():
+            doWindowsRedistCheck()
+
         self._client = client
         self.__ui = ui
         self.lastNotificatinOSDMessage = None