I don't have the Steam version, however I recently bought a Saitek X55. Right before it starts asking for the activation, I notice alot of my buttons quit performing their functions properly. It all seems to start with pressing of the CTRL key.
Even after I "activate" the software, it keeps doing it. Almost ready to say screw it and buy the steam version, don't have issues with steam DCS World or the F-15C Module, even with pressing CTRL