But the update is causing error when launching KJFK KLAX and CYVR, basically all FSDT airports I have.
Are you saying GSX works everywhere, except on FSDT airports ?
That's strange, since these are obviously the ones we always test first and most. Have you perhaps MOVED the FSDT sceneries from the folder they are installed into by default, into another one ? This will surely cause problems, but that's not something new to this version.
In any case, if you are sure you updated everything correctly, then contact me in private for a Teamviewer session, because I re-checked it again, and everything works normally, tried KMEM, KLAX, KJFK and CYVR, all working fine.