Is there a way to get the Doom II RT Mod working with the GOG release of Doom II? When I launch the mod it looks for the Steam version.

I finally got this mod to work with the GOG release. The "doom2.wad" from the "DOOM + DOOM II" release doesn't work. After dropping it in the same directory as gzdoom, I kept getting the DOOM2.wad not found error. Once I switched to the "DOOM2.wad" from the "DOOM II + Master Levels" release, it worked. The files from the different releases are not the same.