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.
A Mac GUI version of innoextract can be found here: https://macsourceports.com/utilities
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.