Hi Aeon, sorry for the troubles.
The registration/confirmation emails, must be regarding this website (to go onto this forum), which is different from the activation key registration for your license. I understand having two separate systems are not ideal – later we will have only one.
Anyway, you are doing it correctly by clicking the link in the activation key window. It must have been a temporary thing with our webserver. We have been experiencing some overloading lately. But it is working now, so please just try it again.
Let me know if it works for you or not!
Thanks,
Niels