..but I wouldn't know:

Purchased on Wednesday.
Tech supports answer (a day later...) was "try pasting the serial number in." A fantastic way to burn a day of turn around communication. I posted the following on the BI thread,
Did you ever get this resolved OP? I'm having the same issue.
-Firewall is COMPLETELY OFF
-set user email as exact caps as on my account, and tried several variations. My email contains no special characters or spaces.
-ToH is @ version 1.05 and I confirm it works (used the 1.01 to 1.05 version of the patch, not the 1.04 then the compatibly patch)
-run the install program as administrator (Win7-64 bit)
-SN is copy/pasted directly from my email
Also,just to be clear, when you say CD key, you mean serial number, correct?
I contacted support by email, figured I'd ask here too.
By the way, why the hell does the help link on the activation pop-up take me to the Impulse store...
So that's pretty cool. They happily took my money, but take their time giving me the product.