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.
Duangeor, Duangeor, Strelok, [Gmod4life] Miscamingone974, xxxxxx, EnderDragon ☢SDI☢, Senses, lightblaze894, The Mighty Edwini, CaptainRus, CaptainRus, tarihcicimbomlu, Error, gibus, snyxnon, pivnyov08, epsilonch., Brother Horalis, cokunemir, lolopop.kik, Doberman_Imperialis, loggerhead75, SpilledBleach, D34THPUPP3R, The Gifting Ranger, NiqqSlish, matrosowalex, [IMEFA]SweetL1lac, Shalashaska, Kein, , Glem1011, ✠ Į∮קίţ ✠ ☜Ⓒ❾☞, ° :., [911견인]푸딩, Майский Gibus, Æ-Actual, sanko.domn, Lord Commisar Vanilla, Ronnie Paints, Alien, maksimen, sagar, Karolina, DeadInside, DeadInside, Любитель, yoloer2004, blackwolf, ..::☣S.T.A.L.K.E.R☣::.. +65 others
