Step 1Download the .rar archive and use a tool such as 7-zip for Windows or The Unarchiver for MacOSX toextract the folders.
Step 2Copy those folders to:
Win Vista/Windows 7: C:\Users\\Documents\Sports Interactive\Football Manager 2013\graphics\kits\
Win 2000/XP: C:\Documents and Settings\\My Documents\Sports Interactive\Football Manager 2013\graphics\kits\
Win 98/ME: C:\My Documents\Sports Interactive\Football Manager 2013\graphics\kits\
Mac OS X: /Users//Documents/Sports Interactive/Football Manager 2013/graphics/kits/
Create folders "graphics" and "kits" if they don't exist already.
Step 3Run Football Manager 2013 and go to: Preferences > Interface
Make sure that you tick the check box on the page called 'Reload skin when confirming changes in Preferences' and un-tick then box saying 'Use caching to decrease page loading times'. HitConfirm.
There should be a box that pops up saying 'loading image data for the new skin'. Once this is done your graphics should be working within the game.