What do you mean with "doesn't work" ? If you have inaccurate parking positions, that's normal on 3rd party airports, because the AFCADs supplied with My Traffic shouldn't be used on 3rd party airports.
If, instead, you mean nothing works and GSX is not even starting, it's possible the installer has corrupted some FSX files somehow.
Do you still have the "Addon Manager" and the "Couatl powered products" under the FSX "Addons" menu ?