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.
K1ngl3Y, Thot Patrol, dovahkiin8600, PuffFreex, Skymenfeed, Maru Maru ><, nexyetyan, MarsTwilght, SunsNation, Mohammad 3> Iran, ღPink Wingღ, Eleson Tan84, [FG] Senpai, ultrix, ninjadragon15000, formoverfunction, darkrhino, melikzade012, cokunemir, soulsnares, NocturnalTwilight, Anzhi_shuiJing, dariodados, sasha.kochergin.04, cruzito.link, Moksemka, ᶜᵇDarqiᶜᵇ, igor.nanana, Yultzman, Alpha_Prospect, aidanrunions, EL GENERAL, XxXGoLdZzXxX, jacky51702, МИХА, Pagondor, Adam, pascalstonus, hotshot1962, Bond22 Br, zmarshall1997, littlefizz, derekdenneack, Imperioni, shizozavr, Dusty, lelyachervinko, ITz_St3vi, CarringtonTheObscureGamer, Я ЗЛОЙ МРАК! ^_^ +736 others
