Where are you placing them ?
Are you extracting them ?
 
It seems to be a problem, and a totally random one at that. For instance, I can't install skins but I can install logos. Yet, some people can't install anything, while most can install everything.

Incredible annoying, especially when I installed loads of skins, logos and facepacks without any problems. So I know what I'm doing, it just won't work in-game
 
Its because the skin isnt for fifa11 but for fifa10.
 
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