I copied the Wolf3D-TC-3.0-master folder to my GZDoom installation folder and then added the following line under in the gzdoom-.ini file: Path=$PROGDIR/Wolf3D-TC-3.0-master I've followed the instructions from this comment: as of this writing) as well as AFADoomer's Wolfenstein 3D Total Conversion 3.0 from Github. I've downloaded both the latest version of GZDoom (4.8.2.