It's too bad that most article on the web doesn't precise the specific version of Doom2 needed for the mod. I have an old but legit version bought in a bundle more than a decade ago (sill have the cds!), and it doesn't work. I get an error message while trying to load it (although I can hear the background music): "R_FlatNumForName: BLAKWAL2 not found". I can load other custom WAD files, but I guess I'll just forget about this one... Nice idea, still!
EDIT: I forgot to mention it's loaded on the Doom95 version, working on both Win95 & XP PC I have.