Salut, go there:
http://www.limewire.com/english/content/skins.shtml
A simple woraround is to download from HTTP (via browser) --the second link for each skin-- . You'll have to install skins yourself that way.
Easier for you is to do a .lwtp search in Limewire, it will install skins automatically. (in this case search for "black .lwtp")
Bonne chance
PS: bpmax, you answer posts when you don't understand
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, hahaha j/k