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.
Neondromeda, Gunslinger Dust, borya3737, Nameless™, cupheadmugmanismug, ihaveagun, JeezLuys, Paradox, buriedsmash, amiraligame2021, arthurd, JustPlayn10, hasanemrekocer, savanylov, Dog, GTSMRLoquendo, Alfking, naenaemarieclouds, evantheegoduck, luisjavier020609, miguel918.h, milanszekeres703, nawaboonkung, Babbe, nandohenz, jedus2005, ditocarepito, dandragon401, Vestige Vapor, luiselsenpai, conercartoons, Prince Titi De Montaigu, EymenGamer201, 1qwferma, bronkapsd, Pichux400, salomonenicola1, yefersonanmyr76, sansandpapyrusgaming96, piper.secrets, Zeta, georgi_jakimov85, hexer54539, golddovelo, Ecaten, Random1983, Sebas 6564 en cuarentena F, CooliusFoolius, man.marco08, kirvi_jack2889991 +1236 others
