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.
ninaib89, cami.barber.v, ACelBoy308, I Voted For Kodos, furno226, Los Retardos Leopoldosss, natcmnr1875, kio_meow, optimus, Lordali158, herycdepaulo, bryanrusty1, danendrasaskara, Dark22Raven, slenderwants329, fareskhaledakel, RikyBj, 姜饼人, antonioaugustolsm, chuaypichai62, duchieu2312, MX ZOLA #187, yanndg, aounrana87, Alien, DarkCoolBoy, krzysiu.brylski, krzysiu.brylski, medic2334 springtrap, bobcho03, KINGOFSPIRITE, FadingShadow, Mr.Blaziken, Bartey, TheNewKunoichi, rondthalersebastian, danil-zhukov-00, kevin2016tapia, dragonmetal153, AppleWubs, mortovivo2017, Axiom, Axiom, rb60646, yasinheisch, Merxexe, gipyonda, re15revisited, jugos999, My Name İS DEDŞAT +250 others
