I just did a clean install of P3D 2.5 and when I try to register KLAX (I did not try any other scenery yet) P3D crashes.
Additionally, after the failed registration, P3D crashes on startup (error log points to ai_player.dll) until I delete the KLAX entry from the windows registry.
After deleting the registry entry P3D works again until I try to register your software.
I am confused...
(Running Win 8.1, btw.)