Lady M's right, neither Kazaa site charges unless Kazaa has started recently, in which case I would have used Kazaa lite instead. Obviously it's too late now, but it hasn't cost too much and you do get a lot for it. The URL is
www.k-lite.tk They (TK) are an independent web host and not an actual country code.
Legally, I'd echo TW to not get too involved with that side, but though the Americans prosecuted a few heavy users (I don't know if the cases are over yet) the British authorities have no plans to do anything about it.
Kazaa Lite does work well, though both Kazaa programmes go down from time to time in their own special ways. K-lite is a bit less reliable, but when Kazaa went funny it used to slow the whole computer which is why I stopped using it.
Finally, don't get caught downloading programmes without an anti virus protection, I had 3 sobig attempts in a row hidden in a firewall and it was all caught in advance. Kazaa itself has no virus protection and will pass all files sent including nasties without vetting any of them.