DarkStern - [Loading Screen] by Mijit

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

• darkstern/
  • assets/
    • css/
      • style.css
    • images/
      • background.jpg
      • home-icon.png
      • icon-bg.png
      • logo.png
      • map-icon.png
      • screen-icon.png
    • scripts/
      • jquery.js
      • main.js
  • index.php
  • news.php
  • README.txt
  • settings.php

<hsv>MeyersleBgASKIP</hsv>, not, BlazeEnder, Microsoft Excel, SG3xHERO, staff.yourlife, Jesh, Ben Gold, tilerthetiller, Jason Walker, bullylazy, Ananasas, IMeanLikeOk, NJQueen, fatal83, th2drago0, JETUEPA, Czak, Харик, RELAX, EͭJͦEͯCͥTͨ, Борщик, Gumball~iz~Rivii, Gumball~iz~Rivii, Yagouroko, game boy colour, NekoChan, I swear she was 18! ツ, ᠌᠌ ᠌ ᠌ ᠌ ᠌ ᠌ ᠌, eliot.s956, eliot.s956, adam.aguilar2015, AntiCheatv4, Smoothie, Havis, AusRaider, Maximusboy, [JoMä] Balance is weakness, manofmeakins, Shake, El Niño Loco, [Holder] AleexxAX(LaChocloTeAmo), Memeulous, Vladimir, Krotex, priceyplantcassowary21, Gamer688, [.broke] Sprax, Araja, голдик +1915 others