gizmo's_holo_plane.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
          • Holo plane <-- Addon folder!
            • e.g.
            • lua
            • maps
            • materials
            • models
            • etc

• Holo plane/
  • Data/
    • Adv duplictor/
      • Holo plane by gizmo.txt
  • I like this folder!/
    • l.txt
  • Read me on how to use plane.txt

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