css_knife.zip

This download looks like a lua file. You need to place it in your lua folder inside the Garry's Mod folder.

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

• steamapps
  • common
    • garrysmod
      • garrysmod
        • lua
          • autorun
            • info.txt
            • lua/
              • weapons/
                • css_knife/
                  • shared.lua

• info.txt
• lua/
  • weapons/
    • css_knife/
      • shared.lua

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