diff --git a/FlightGear.iss b/FlightGear.iss
index 51a8f9d..3e73b8e 100644
--- a/FlightGear.iss
+++ b/FlightGear.iss
@@ -79,7 +79,8 @@ AppPublisherURL=http://www.flightgear.org
 AppSupportURL=http://www.flightgear.org
 AppUpdatesURL=http://www.flightgear.org
 DefaultDirName={pf}\FlightGear {#FGVersionGroup}
-UsePreviousAppDir=no
+DirExistsWarning=auto
+UsePreviousAppDir=yes
 DefaultGroupName=FlightGear {#FGVersionGroup}
 UsePreviousGroup=no
 LicenseFile={#FGSourcePath}\COPYING