diff --git a/UpTool2/MainForm.cs b/UpTool2/MainForm.cs
index ee16cc4..9337996 100644
--- a/UpTool2/MainForm.cs
+++ b/UpTool2/MainForm.cs
@@ -258,7 +258,8 @@ namespace UpTool2
                 MessageBox.Show(e1.ToString(), "Install failed");
             }
 #endif
-            Directory.Delete(tmp, true);
+            if (tmp != "" && Directory.Exists(tmp))
+                Directory.Delete(tmp, true);
         }
 
         void completeInstall(string app, App appI)