activation public 100k available - please tell me this isn't true

Hello.

I clicked a link on Gizmodo.com today that led me to a page that stated 100k
downloads of Pre-RC 1 Build 5536. I downloaded just fine and did not see
anywhere a place to register or obtain an activation key.

When I installed I bypassed that step, (foolishly), thinking there was some
magic or tracked activation voodo in the actual download.

Now it looks like I have 14 days to activate and no key. Am I screwed? Is
there a way to rollback to my previous build, (xp pro)?

Any help is greatly appreciated.

Thanks!