You can visit the site and read carefully about the Pro version. Im not a Pro user but, you pay 18.88, and then you will get 6 months free updates and you might have to renew again, Im really not sure how that part works, Im sure a experienced Pro user will jump in to correct me if im wrong.

Beware of the scam sites the official site is the only place to buy Pro from: www.limewire.com.