If you have problem with the theme Registration / Activation :
Can you please make sure that your server accept the CURL function, that folder and file permission are set correctly and if there is a firewall to accept the following address :
Also you can make sure that the server is using the settings recommended in this article :
What To Do If Demo Content Import Fails
If you contact your host support they should be able to do everything for you and then you should be able to register the license!
After this if you still have problem, please re-contact us and give us access to your dashboard and phpadmin.