>>720491745
Remaster, GoG already added that into their Quake 2 Remaster mods too so is just plug and play there.
https://www.gog.com/en/game/call_of_the_void
Steam is just the Moddb release
https://www.moddb.com/mods/quake-ii-call-of-the-void/downloads/call-of-the-void-version-1-0

just be ready for the bullshit that will be upon you here because it is from the same guys who made the Blood+Doom mod and that was fun as fuck with the monster mix.