mor_facility_cv1 by Demonkush

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
          • mor_facility_cv1 <-- Addon folder!
            • e.g.
            • lua
            • maps
            • materials
            • models
            • etc

• mor_facility_cv1/
  • maps/
    • mor_facility_cv1.bsp
    • mor_facility_cv1.png
    • mor_facility_cv1_morbus.txt

BuzZoiD, BuzZoiD, 『ＯＮＤＥＲＳＵＮ』, Player, [GmodStore] RapidFireKing2127, mossesx, vittorio.cadei, Nemesii12, alexshulski, EteR society.gg, tiago98751 csgostep.com, Lit Profile Pic, King Garrison, Alien, raeef-fu, bonnie.opazo41, Nattax, MuchGamerWow, סּ SoloPlayer סּ, Thibaud - LordAtroph, [TG] ERROR, zennat.3195, Ellisa, falseprophet141, The Hoffmann, gandalf, StarGazer007, Ducky, rakuzanislove, Elena Stark, s0me1, s0me1, martucopg, Aterro, crowlowery, GameJack, umutyildirim383, Mr. Metric, wangshiping3507, Yagich, gold94chica , Kiruex