This download looks like an addon. You need to extract the downloaded zip and put the addon folder in your Garry's Mod addons 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.
biela doblada, havegemwajete, cliffjohnskie2, illagame181, klutzy, jjdf, helloneigirbor, Dumber then a box of rocks, peba, nordhusnie15, jdavidhormaza, bryfrancramos, molinafranco981, superidol8964, egeowuae55, BruhGuy, invaderkatt, سس خرسی, JunkieOhneCash, minimogus, djouahraayoub201919, Marci8216, tolentino1227m, sebalimpayante, seyhanpsn765, MrX_kasra555, Klaud, Jiggy, aimanshawal2019, Wolf_Aleksa12, noobieblox1234, toralesnose7, Kirito, MerlinTheWizzard, lihuelgatica227, rilinko, cat342, fabriciorm335, thekingxdpgod, a83423394, cuellobauti8, Chara Yuki, Fermoas banditcamp.com, fladdnoob, emijek64uchiha, the g, grimmdustries, alucard, Kledioniii, Herdik123 +38585 others
