Beta 2.0 program has ended they'll be another round in few months for 2.5 or 3.0 which ever happens.
You can get 2.0 by just going here you get the trial and activate it with a windows live ID if you don't have credit card you can go to any store and buy one care there and use the key to subscribe to 2.0
The servers the disc access will install 2.0 reguardless of the version on the store bought disc.