If you purchased LW PRO from the official site & your support period is still valid then no. Check your emails for the original email sent to you by LW customer support. That will have the link to your personal pro download page.

3 x LW Pro's:
Extended -> 12 month support with updates = $34.95
6 mth support = $21.95
no support single day accessibility to the pro download = about $15

Also check here Support & FAQ - Peer-to-Peer & BitTorrent File Sharing Software - Lime Wire