Upd: Realflight 7.5 Download

Once the download is complete:

: Reinstalling from your physical DVD is the standard method. Lost Disc/DVD Drive : If you have your serial number Realflight 7.5 Download

Horizon Hobby / RealFlight no longer prominently lists 7.5 on their main site since version 9.5 and Evolution are current. However, they maintain a legacy support page. Once the download is complete: : Reinstalling from