x-plane flight simulator, simavio, FlyThisSim database repair

FAA flight simulator by FlyThisSim is based on x-plane with add-ons and controls to make it an approved flight simulator for actual training. However, the vendor FlyThisSim closed a couple years ago and no longer offers support. Somehow the database holding the airport data and navaid data has vanished. The flight controls work fine as do the instruments, however there are no navaids in the navigation unit and the scenery is missing the airports and most of the buildings. It seems like the database holding this information is corrupted or not connecting to the sim anymore. So this needs fixing.