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

• Gminer_pack/
  • gminer_minecraft.txt
  • gminer_minecraft_nobf.txt
  • gminer_minecraft_pig.txt
  • PropCore_code.txt

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