Red & blue skin for HMG by Wolfpac
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The zip file is set up so you only have to extract the pak4 file to your Kingpin folder. This will place the pak4 file in your kingpin/main folder.

If you already have a pak4 file in your main folder then extract the new pak4 to a temporary folder somewhere and rename it to another number such as pak2, pak3 etc which you don't already have. Then copy it to your kingpin/main folder. 

Enjoy!