If you want the normal skin, put all the files in the Windows/Mac folders depending on your operating system except the files in the "Old Player Profile" and "Poland Language" folders.

If you want to use the old player profile template that no longer has the large image but has the large polygon, put all the skin files and add the file in the "old player profile" folder and confirm when it asks you to replace.

 For Polish speaking players you need to add the file in the "poland language" folder which fixes a bug in the message box.