Follow the instructions in the readme's that came with the pack.
Simply:
1. Download.
2. Extract to where you downloaded.
3. Transfer the created folder to:
Kits: \Football Manager 2006\data\graphics\pictures\kits, it doesn't matter where within this folder you put them, but for you to easily find them in future, put the
prem kits in: \Football Manager 2006\data\graphics\pictures\kits\clubs\england\pre m
4. Load up FM.
5. goto the preferences menu, scroll down, make sure player faces and logos boxes are ticked if you want to use them. Untick use skin cache.
6. Select a different skin. Click confirm.
7. Faces/Kits/Logos should show. If they do go back to preferences menu and switch back to your normal skin.