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.
g_g1, =D, Hengezwo, Lame, OK2, Jurandir, Napoleon, ItzKrilir, tone, c., lorezcos3ldon, lorezcos3ldon, lorezcos3ldon, lorezcos3ldon, lorezcos3ldon, MetaIMasters, koroglualperen014, cl92435, daiidalus, CharlieCharply, Phuncky Feel One, Alex, ✨Jojo✨, Straight From The Bin, Jib, semih24, alflonz åberg, unagidonburi, 빙글이 도라영~, qi, wachis.17, Hypperone, Cyke, AJ4X, AJ4X, bvbmafia, Strelok, wallacepolita, igorlj, Tompsa, Andrey_Saratov, The_wizard_NL, anskima1000, Asgere Dreemurr, DeaconDiamond, HookersAndBlow, Steventechno, Alex, saos, V92 +5 others
