Well, there's UBB 6.1.0 coming out soon - you can download betas now!
And you are missing out on all the updates since 6.03, theres 6.04a-f and UBB 6.05.
But to get rid of security holes and bugs your best bet is to renew your license <img src="https://www.ubbcentral.com/boards/images/graemlins/smile.gif" alt="" />
