.... Yawn .... Hum Official limewire as you call it can be "basic" that is free, or pro which costs 18.88$ I think and I'm not about to check again.... see www.limewire.com for full details.

It would seem to make sense if Your Friend was trying this out for the first time to start with the free version and see how it works out. Then he could upgrasde to Pro is he wished.

This is all set out on pages linked from www.limewire.com and if you go there this is all reitterated. Further more the refund policy of Limewire, and the reasoning behind it is laid out on those pages.