Hello gents, FWIW, I am running the Steam edition of FSX and was informed that the non-Steam version of Aerosoft's beautiful F-16 would not work. People are being encouraged to purchase the Steam version of the Falcon. For kicks and giggles, I installed the non-Steam version anyway (as well as Aerosoft's Dillingham Airbase in Hawaii, which is also not supposed to work on Steam) and both run like a dream. I can even turn on the HUD and MFD's and she's ready to go. So, if you already have the F-16 from Aerosoft (and, IMHO it's one of the finest add-ons ever made), don't buy the Steam version. Your old one should work just fine.