Hello,
Sorry to hear you are having trouble.
ggeorgiev2001, tamazonx, lradunovic
From the looks of it, you all never actually activated your purchase. You can get your key with this link:
http://www.stardock.com/support/productkeyretrieval
(Problem is I can't start Start11 after installing it to activate it, so... I guess that's why it isn't showing under My Downloads.)
Why can't you, what happens when you try? You should get a prompt like this to enter a key when you attempt to open the Start11 config:

I'm getting this message too. Maybe they're pushing an update.
I can see that you recently activated again. Are you still seeing any expiration messages?
That all said, some beta software we push out is set to expire automatically - it DOES NOT mean you are not entitled to the product any longer, its just a safety measure to ensure people are on the most recent version (for example, we would not want someone on a version where there it could be found that there is the potential for catastrophic failures).
Since its late, I can't verify that for certain that this is the case with .50 (that it may be forced to expire) but it will be a priority for me 1st thing.
What I want to be certain of now is that:
Again, sorry to see more than a few with the issue but we will get to the bottom of it.
Sean Drohan
Stardock Support Manager