your_money_is_here.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
          • Your money is here <-- Addon folder!
            • e.g.
            • lua
            • maps
            • materials
            • models
            • etc

• Your money is here/
  • info.txt
  • materials/
    • models/
      • caps1/
        • nukacolacap.vmt
        • nukacolacap.vtf
        • nukacolacap_n.vtf
  • models/
    • caps1/
      • BottleCap.dx80.vtx
      • BottleCap.dx90.vtx
      • bottlecap.mdl
      • BottleCap.phy
      • BottleCap.sw.vtx
      • bottlecap.vvd
      • BottleCap.xbox.vtx

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