Umberto,
I have installed the latest update via the stand alone manager, and I am able to customize most addon airports, except any German Airports from Aerosoft. EDDS EDDT etc etc. Was able to before this update, but the airport cust option does not show up in the Coauti menu or F+12.
I use AES for Jetways only, so at GAP Vol 1, 2 & 3 I get the GSX air stairs and the jetway.