stormy_cove_map.zip

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

• Cove_Map/
  • info.txt
  • maps/
    • gm_stormycove.bsp
  • materials/
    • maps/
      • gm_stormycove.vmt
      • gm_stormycove.vtf
    • skybox/
      • nightbk.vmt
      • nightbk.vtf
      • nightdn.vmt
      • nightdn.vtf
      • nightft.vmt
      • nightft.vtf
      • nightlf.vmt
      • nightlf.vtf
      • nightrt.vmt
      • nightrt.vtf
      • nightup.vmt
      • nightup.vtf
  • sound/
    • Cove/
      • Cove Sounds.mp3
• readme.txt

masascuate666, notme18938, nossir_b, smtbrssteel, Tôm, Eluvium, re15revisited, teatrotorres, enzaim3001, lb62mike, kobolotin, Shrunk, xzcfe, jgvg24, 1bHC, Liam., Jack92, 찰리와김치공장, Alex, V92, chief slapahoe, TheAviator™