NeuroTec Collection - WEAPONS 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

[IG] Nate/Zunn, afdas, Zyad, ortegacynthia953, uBaHbI4, riconow, brettaw123, sjnm66, egyszeruenmark, topewniejerzy8 key-drop.pl, xavenger539, xkiller201, dan4ik2019112, recotra2, Erotiq Adam, Thiago, Забивной(Добрый с, olcayeroggglu, Kaciedelic, enzogmod10, TekHat, AllmyteaGamer415, jirapattkg.1016, keskinerbirtan, bakerw1481, Czinczyk, play24135, T.B.S., Immortal Soldier, tomayerattika, 氢化氧, ♰︎SИIPΞЯ♰, juanantoniolopezsanchez1, stinker90011, Lucky38, Ariel, bozachetnik, BOT Eliot, karlosmon9, Menockcidez, Scuttlebutt138, GLEBZOO, depthniki, (★)ŘĐ, Anomaly, shaun0838, ignaruggeri, abadone, abadone, Nami +4786 others