There's no license for the betaversions. They are only usable during a limited period till the following new betaversion.
As to the problem with the 2008 license, I think that's a technical question you should report via the ticket system to the Macecraft support team: http://www.macecraft.com/contact/ or http://www.macecraft.com/helpdesk/createticket/
Furthermore you could read usefully: http://www.macecraft.com/phpBB3/viewtopic.php?f=1&t=3319