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.
derrylio27, The_Macross, Fox Toast, Lamiiku, Lamiiku, Lamiiku, czechowski.k, CturiX, RandomDomo12, Eluvium, mossesx, danilstarbird, Piloh Jolie-Schitt, Detective MAGNUM, vielvladimir, vielvladimir, vielvladimir, Max, btt.7698, falseprophet141, errollees, NaxoKiller666, Exile, Darklin_Spikez, 1-800-273-TALK, aaaaaaa, JeffreyWoods28, aprogamer5, .;>|<;., HookersAndBlow, Ultimatum, Ultimatum, RShibbs, Antagonist DC, GavinTheHero, Forg(R)otten, vic, dirtpeanut, kkelloggx4, =ΡΡ= 419, [ZPS] Faithy, Wallpox, A.Loopa / KlonoaausWinddorf, Waffleman Jones, caron.paul, 169PD, andrewdbuilder, hdtv480p, [EX] XaZ ☭
