NeuroTec Collection - BASE by Hoffa

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:

• steamapps
  • common
    • garrysmod
      • garrysmod
        • addons
          • <-- Addon folder!
            • e.g.
            • lua
            • maps
            • materials
            • models
            • etc

Federicop11 skinhub.com, CMDRSpinFire, [IG] Nate/Zunn, Luntikと彼の娼婦の冒険, noeliapajaro82, Zyad, antonisbozas, ortegacynthia953, Sasser, Blessthismess, zaintalpur46, goker771, 大兵小强, LA PALOMA GAMER, uBaHbI4, hucrack5, brettaw123, SANS:v, sjnm66, Doritolord50, xkiller201, danyadnana, miguelnc1975, dan4ik2019112, recotra2, Erotiq Adam, Jospac, Thiago, Забивной(Добрый с, olcayeroggglu, olcayeroggglu, joke2008, Kaciedelic, Cabo, dexarsongtx, Buttered_Oranges, ErikLarsson12, Tsuyoi_Might, elitrut, Radiation Slav, Dewwment, xXBlasterXx, pumnajr, Reza8772, ()_/+_^\_(), mahirakman7363, Oliver Lees, T.B.S., Immortal Soldier, Uzbrojona Alpaka +8688 others