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.
masascuate666, black_manowar, notme18938, notme18938, IceSakura_VtuberOficial, Spooky, nice person, Shoawl, Lord_Draculea_43, com.antilles, GOZZ, GOZZ, Max Deavis, L O V O X, Frozen Flame, petovics, Yeehaw, SʎNN, Lamiiku, __Katsumy__, \/oid_₲rεy, Shadow, rumoragui, snowyterro729, Kishiro Usu, lookzie Farmeskin.com, yefelshon001, hakan072007, AtoD, josemi159, irfan650, zehra_klkci11, zehra_klkci11, Mr. Vorpat, Chriswelsh23, XxHunterBrosxX, ultima_sword, Thomas Wayne, lencie_pence, nikinson, D4C, Harambe Uchiha, nachosilvaroa24, nachosilvaroa24, LiL Water, 03kj20f03232, JohnZick, Kasara, bahamondespastenes, BLACKRAIN +273 others
