So i got unity3 30 day pro trial the day it was out, used it for 1-2 hours then was busy for that month. Now i come back to use it a few months later, and it says i need to renew my liscence, so i click renew, and nothing happens. I uninstalled it and put on the new version, still happens.
What do i do? 
Issue is still occurring.
Tried to re-install, delete regestiry keys and all files, including in appdata.
If i click renew button, nothing happens.
Hello,
I have the same problem with the renew. Is there some logs from Unity renew process?
Thanks
I think you lost your opportunity… once installed you have 30 days, that’s all.