When you install it using the exe installer you have to change the destination folder to C:\Program Files\RealFlightG3\ColorSchemes instead of the folder C:\Program Files\RealFlight\ColorSchemes. This is if you have your Sim installed on your "C" Drive. I just put this one on without any problems. You may also notice that if you used the install program it made a folder named RealFlight with another folder inside names ColorSchemes. You can Delete this if you don't still use G2.
Jim