Earth-Class Corvette

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
          • Put the txt file in the advanced duplicator folder <-- Addon folder!
            • e.g.
            • lua
            • maps
            • materials
            • models
            • etc

• Put the txt file in the advanced duplicator folder/
  • earth class corvette [used for terraforming operations].txt

subzero41148, TheRed, [TF] Miscamingone974, maks.kudrenko, anthonycottam, ุLAW, Nekyto, goldendannyv, jkyyooo, KENXY {RU}, truck load a trash, [M]:[R]:[X], mateuszb494, Dorko, blerimiseni, ceva199, Ben Dudester, goderek91