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https://zandronum.com/ - first download this program. Its a doom mod and a multiplayer doom community

https://freedoom.github.io/ - go to download page and get the first option, the phase 1 and 2 (doom 1 and 2)

download moon man mod - https://files.catbox.moe/pgk6nr.pk3
alt moon man download site- https://mega.nz/#F!8CoynCzI!dn52otzbyGM_gpwWILc2KA

C:\Users\yourusernamehere\AppData\Local\Zandronum - is where the directory will be. Simply drop the doom files from step 2 (freedoom1 and freedoom2) and the moon man .pk3 file into it.

double click play moon man (The moonman .pk3 file), and you should be good!

P.S. This took me a couple days to figure out. Not quite as easy as black lives splatter!