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.
Lemonade_Lemon, 겨울비, Slajmos, liljedi11, 링링, mossesx, RonGaming, ferb05, poderyuyu, Outhale, fandaffle, devanandma, godwk530, Natascha1996, masamasa1234561, Clazzor, DeltaflexX, pumadeaur, ScoutyScout, derinka, archekitai, luuyfigueroa, BowlG, parfenyk, silenceblackwolf, jenkins30661, simtae1833, kulich.adam, menotpopSK, kiver1234, Eldricktigerwoods69, Epic, Killer_Ghost360, fauzhassan, Endangered Thing, wkdb1641, 메에에에딕, 메에에에딕, sheenoby.cg3, nigaiame1830, DrokosCZ, MyFishy, ouais_ouais, Patrikíno, edet92, KOMO | Pvpro.com, btwarrior, caleb_gravel, money93577, RoiLinkVideo +208 others
