Some of you have encountered problems successfully downloading, registering or installing Beta 2. As you know, Microsoft just released two of the biggest betas in our history simultaneously and we've encountered a couple problems.
Our download capacity has been expanded, so downloading shouldn't be a problem anymore.
At this point the load on the activation servers is the bottleneck.
We are working on a fix and that should address the problem and folks should keep trying to get through.
Sorry for the trouble!