This download looks like a save. You need to place it in your saves folder inside the Garry's Mod folder.
You should end up with a directory structure similar to below:
Don't know where the Garry's Mod folder is or how to extract zip files? See more useful installation tips.
Jelly Butter, SONIC.EXE ANIMATION&GAMING, Kaaarma, Kaaarma, Rubick, M O X I Ξ, Bob The Man, Doomslam, [LFG] FallenDj122, Rellzy, Mist3rLuck, Halo 1080p, spielcontroller, NoName, Fedelefante BETS.gg, sagar, Cokacola, [VDDS] K.N.cfg @ Jeahy, 밀크|milk, the great papyrus, Mrpinksheepmlg [T . B . P] ♧, Sgt. B. Blackburn, SnowSmasher csgobig.com, ∂σɢє, Robin, derekSTUFF07, Sloth, Useless, DaZe Fungus, Nekros, ???, Alo0iis, ^0AllHacks^1NoSkill, syno04, wolfboydaalpha, Mr. Snow, Supah Maryoh Brudder, gtakiller33, nickles.101, 老貓 - TheOldCat, 老貓 - TheOldCat, VPG001, MAP갓시민, ThaCerealKillah, Alukard, Uber MEM, 끔직한 잡종, Sharky, Sharky, ✮✮Black Gold Saw✮✮ +169 others
