Gordon Freeman Anticitizen One

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
          • DPFilms Gordon Freeman <-- Addon folder!
            • e.g.
            • lua
            • maps
            • materials
            • models
            • etc

• DPFilms Gordon Freeman/
  • info.txt
  • lua/
    • autorun/
      • Anticitizen_one.lua
      • Anticitizen_one_Player.lua
  • materials/
    • models/
      • DPFilms/
        • Characters/
          • Kran4es_Freeman/
            • cs_office.vtf
            • eyeball.vtf
            • eyeball_l.vmt
            • eyeball_r.vmt
            • eye_ao.vtf
            • facemap_sheet.vtf
            • facemap_sheet_ep2.vtf
            • facemap_sheet_ep2_n.vtf
            • facemap_sheet_n.vtf
            • frame_mat.vtf
            • frame_mat_n.vtf
            • glassesframe_front.vmt
            • glassesframe_side.vmt
            • glasslens.vmt
            • glasslens_ep2.vmt
            • glass_mat.vtf
            • glass_mat_ep2.vtf
            • gordon_headmap.vmt
            • gordon_headmap_ep2.vmt
            • hairbits.vmt
            • hairbits.vtf
            • hairbits_ep2.vmt
            • HEVhelmet_exp.vtf
            • HEVhelmet_glass.vmt
            • HEVhelmet_sheet.vmt
            • HEVhelmet_sheet.vtf
            • HEVhelmet_sheet_ep2.vmt
            • HEVhelmet_sheet_ep2.vtf
            • HEVhelmet_sheet_ep2_n.vtf
            • HEVhelmet_sheet_n.vtf
            • HEVsuit_sheet.vmt
            • HEVsuit_sheet.vtf
            • HEVsuit_sheet_ep2.vmt
            • HEVsuit_sheet_ep2.vtf
            • HEVsuit_sheet_ep2_n.vtf
            • HEVsuit_sheet_exp.vtf
            • HEVsuit_sheet_n.vtf
            • mouth.vmt
            • mouth.vtf
            • mouth_n.vtf
    • VGUI/
      • entities/
        • Anticitizen_one.vmt
        • Anticitizen_one.vtf
  • models/
    • DPFilms/
      • Props/
        • gordon_glasses.dx80.vtx
        • gordon_glasses.dx90.vtx
        • gordon_glasses.mdl
        • gordon_glasses.phy
        • gordon_glasses.sw.vtx
        • gordon_glasses.vvd
        • HEV_helmet.dx80.vtx
        • HEV_helmet.dx90.vtx
        • hev_helmet.mdl
        • HEV_helmet.phy
        • HEV_helmet.sw.vtx
        • hev_helmet.vvd
    • Inaki/
      • Characters/
        • gordon_freeman.dx80.vtx
        • gordon_freeman.dx90.vtx
        • gordon_freeman.mdl
        • gordon_freeman.phy
        • gordon_freeman.sw.vtx
        • gordon_freeman.vvd

joosephmanso, The Wiggly Flamingo, hansj4514, bauti720.bs, GameHunter, FANTAGAMES, ugthdhdhdhe, nurshuhadahanilamusu, lucianars10, psychomedicgurl, 阿什, [黒の鳥] El Moticuquito, gmonsalve97, facurojas617, weerapat.fluck2552, JohnBarry77, gerocraft2019, gerocraft2019, niazovniaz10, chochin7675, TSG, marceloburgos689, 1roadboys1, SpiderMew, deny, josemiguelochoa91, Ali-Alastor-Sans, Ali-Alastor-Sans, my.little.pony.mix13, ZER0_YT, Суч-ок, laabeja1lol2, rjuniarsyadanggoro, mateuszwmwielgat1ti, tom.ran, Wha Heavy, shibashuster058, phys, Postal Dude, Postal Dude, Gordon Freeman, Gordon Freeman, sugastegiancarlo, reda69899, TheFilthyCrowbar, shephardred025, canalmardongameplay, kobjectclass, RobloxnoobXD PL, karakayaeray563 +748 others