GM_Artillery_v2

This download looks like an unpacked addon. You can either convert the files to an addon or merge the folders in the zip with the folders in your Garry's Mod folder.

Convert to Addon (Recommended)

You should end up with a directory structure similar to below:

• steamapps
  • common
    • garrysmod
      • garrysmod
        • addons
          • GM_Artillery_v2 <-- Make this folder!
            • e.g.
            • lua
            • maps
            • materials
            • models
            • etc

Or, Merge Folders (Not recommended)

This option makes it difficult to remove the content should you no longer want it. Merge any folders from the zip with the equivalent folders in your Garry's Mod folder.

• materials/
  • maps/
    • gm_artillery_v2.vmt
    • gm_artillery_v2.vtf
  • vgui/
    • maps/
      • menu_thumb_gm_artillery_v2.vmt
      • menu_thumb_gm_artillery_v2.vtf
• Instructions & Info.txt
• maps/
  • gm_artillery_v2.bsp

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