I tried to download GSX... and suddenly Mediafire pops up with warning about virus on my system and dugdy adverts..
For your info I have Antivirus software installed, and its takes 17 minutes to download and I have a fast internet connections.
Secondly..
After I have installed the Cartayna modifications on EKCH and EDDF for SODE jetways, which is to only modifications I have done. I have not been able to see the GSX Airport modifications in the menu. If this is related i don't know.
All the best
Jens