To register....go here to the main Carlisle Develpment site, (Services)and click on the link for "Express Customer Registration"

For the downloads of service packs, click on "Downloads". This will also be the place you get the upgrade to Version 6, when it's released. That will be within the next two weeks.

http://www.carlisledevelopment.com/services.htm

As for being entitled to the free upgrade to version 6, it goes by the registration date....(nod-nod, wink-wink).