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.
onii_cat, agranadoe64, Im a boy-seriously, gabriellesumanite, saba667781gamehag.com, tuyenthinhpham2, spidercreeper2023, lilibeth2185, cajipoargie, ecuandalebingle, jad500mat, SirAnth, alishahid03313, dhaffifirdausy, javek29697, delenanico141, kidq, Eat Bread, vacad827, luffygames590, minedurcan103, yobinalr0000, mu555_55, tulacg1, omareslamkmal, gamerdanielyt123, zkipper, mourad HOG, joeryandavies007, /Macross_H, cyka, Aksel, simonx_031, kevin.crackrrillo, jesusfloressantiago8, yandbbandy89, tockbluestacks, thatcapthatslays, ibuonihibukimonk01, matiasnrodriguez02, daltonteamo2008, SPARTAN, juancamilolozanoloz, elmasoquista777(f2p), maxxximkostunin, paz.urra.221, deividdev957, javierperezx2, samuelrecrack12, gameharkblack +257 others
