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.
jadeevanjaarseld, sups98673, thiagocvb1, EatMyPasta1, AbdoIR, 6lock 6a6yy, Shadoowplayz1381, KaiKai, trumpsenpai, DraChen, | ☁ Xxsi ☁ |, dunfun v2, ahmeterdemyardimci2, leonelelproaso1234z, santiagomeneses224, LEO_GAME, Zipzon, josemigue3643, rgray212121, 017死全家, J4s0nK1ller, tomas.latorre.i.2008, Kolovrat, verenoxx, ATK-OYUNCU, CYAN KING, mat hue hue, tonycabot.vn, ramazan9191, gracgracek3, Namdontgay, TinyBird, PolskiGamer26 | CASEDROP.GG, cristian23tur3, +DerekHzF+, mynameaaaa, ollemsza, mohamedbouakaz, adasko0613, BROOK_LEAN g4skins, amir vapiano, T4czuS, thezerofaux, ddgabehar, ddgabehar, PempekGaming2308, monteroesteban502, apofiss009, marktube230297z, Blissful1K +8095 others
