FSDT KCLT comes with its own GSX profile, and I suggest using that one. The FSDT Installer will install it automatically when you run a GSX update, even if your KCLT is the Marketplace version.
GSX profiles are always installed in %APPDATA%\Virtuali\GSX\MSFS, no matter where the scenery is installed into, so you can verify if the KCLT-FSDT.INI file is there, assuming you ran the FSDT Live Update after you installed KCLT.