There is no kazaa for the mac, what you've found are scams. The closest you can do is to get Neo, which is a kazaa shadow client (doesn't connect to kazaa servers but uses brute force to find kazaa hosts). Or virtual pc + kazaa.
Other options are to use Gnutella (via limewire or acquisition), Direct Connect (my favorite), eDonkey (via MLDonkey), GiftBoX.
Never liked kazaa personally (eg download something called x and you get y, annoying as hell).