await for setup before run

com.unity.perception/Editor/Visualizer/VisualizerInstaller.cs

         /// <summary>
         /// Install visualizer (Uses the python3.7 installation that comes with python for unity)
         /// </summary>
-        static async void SetupVisualizer()
+        static async Task SetupVisualizer()
         {
             var project = Application.dataPath;
 
         {
             if (!CheckIfVisualizerInstalled(project))
             {
-                SetupVisualizer();
+                await SetupVisualizer();
             }
 
             var (pythonPid, port, visualizerPid) = ReadEntry(project);