As mentioned elsewhere in the thread, you can download the Windows offline installer from GOG, then use innoextract to extract the desired files: https://constexpr.org/innoextract/
Aside from Doom engine games, this also works for Build engine (Duke Nukem 3D), idTech games, and countless others. Very useful tool for being able to play these games legitimately with a modern engine.
go to gog.com and buy a doom2 copy, then forget about it
search for doom2.wad and get it from the archive
get gzdoom 4.x
mkdir -r ~/Library/Application Support/GZDoom && open ~/Library/Application Support/GZDoom
put the doom2.wad in that folder
download the myhouse.pk3 from the google drive and drop it on the gzdoom app
enjoy!