Open ini file in a editor. Make sure the afcad path matches where you have installed the scenery. I have mine installed at :
No need to do that.
We thought users would share their .INI files and, for this reason, the PATH is not read by GSX, it's left there for you, the author, as a reminder which scenery it was made for, but the only thing that GSX reads is the FILENAME so, as long the name of the .BGL in use by GSX is called ENAL_ADEP4_FKH.BGL, it doesn't matter where it is, so files can be shared easily.
GSX manual, Page 40 for reference:
The AFCAD pathname contained in the .INI file is not mandatory: if no file with that name is found in the full path, any other AFCAD in FSX matching the name only will be used instead, regardless of where it’s actually installed.