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.
Violet Scourge, baudoneteneiva, rossivr4625, mat.mat5, wozniakpiotrek90, 488_pista2, zakyzaaboubi100, roloporo84, prokrisz8113333, emmanuelduarteg, connors.460256, daniel.chatillon0921, cml, DoZyFew, 龙魂小帅, arauzdonovan4, frederic.job, gonzalo10010, brandongrant2017, Nekyto, @CiPs [email protected], nicoscalbi, DELFIN-OTAKO, zackorellana.8.9.6, malikrasya026, Key-Drop.pl, stpvsrv01, nockoo26, ISMAIL DIAZ, alalimuhammed689, andres001.p, csgocases.com Sezyaa, zaidbryan93, Luc(RB), CoNfUsIoN, dianasalehrosa, hajekmatej21, JosDav7, Ehlextrix, mus114107, adriangokart123, aekji33, Zlatak150, , Ɠos૯ƬҺ૯Ƈo௱૯Ɓค८k, jochem07.koenders, sebastynomames, Nero~, filipo8302, arturzubek123 +1222 others
