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

• keypad/
  • info.txt
  • lua/
    • entities/
      • sent_keypad/
        • cl_init.lua
        • init.lua
        • shared.lua
      • sent_keypad_wire/
        • cl_init.lua
        • init.lua
        • shared.lua
    • weapons/
      • gmod_tool/
        • stools/
          • keypad.lua
          • keypad_adv.lua
          • keypad_wire.lua

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