Acttually I can't get any airport (3d) to work with the GSX jetways... What am I doing wrong... Always the stairs arrive...
There's no such thing as "GSX jetways". GSX doesn't have any jetways, doesn't control them or have any relationship with them, other than *knowing* if there ARE real, proper FSX jetways on a certain airport, which is of course done automatically if the airport HAS real, proper, FSX animated jetways.
If an airport have fake jetways, GSX won't change that, they will remain static but, you must notify GSX there IS a fake jetway there, because there's no way to detect them automatically.
This is done using the scenery customization page, where you can enable the "Parking has a jetway" option, for those parkings that have fake jetways. You will not see the jetway moving, of course, but at least you won't see *front* stairs and a passenger bus. Rear stairs, instead, will appear in any case, unless you also select the option to disable them.
About the configuration file for Aerosoft EDDT posted in the forum, as the post says, is based on the AFCAD named AF2_EDDT_2009_without_static_airplanes.bgl. Are you using that one ? If no, the .INI file won't be active, and you will either have to create a new file yourself OR, change the name of the AFCAD used in the [General] section of the .INI file.