This download looks like a map. You need to place it in your maps 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.
Thomas Wayne, lencie_pence, D4C, Harambe Uchiha, Oska, 03kj20f03232, JohnZick, Kasara, bahamondespastenes, BLACKRAIN, SpiderMan, erdemlioyuncu07, boredheart, extrasven, Yukkitio, my.little.pony.and.dinosaur, zanofa88, Korea GD, Third, [TMS]Tatsuya, *-FearEngine-*, kgergo5800, stephen91, joalalfred21, asasynx5, Hierophant0, MacBareth, Skow20002, [Naruto:RP] Uliek, " ミ ナ ", mode201744, batuhanaga6575, snake.kain, juliafrank1974, RAIZERtag, johnguzman9696, Wallace™, Wallace™, #PayForHarambe | Yadon, Airnax, paulpeyrot.stjo, shadoko75, WhyPok, ▒ ♛ ριєяяє ♛ ▒, PGAL~ZaRTaX, nayarit555, Link, Tizzidar, Lillewolf, Tebra +211 others
