if you are having any problems with registering, deregistering or just managing your licenses, please visit this website:http://api.muffingroup.com/licenses/
To log in, enter one of your license keys and your ThemeForest username.
After that, you will be able to see all of your registered domains and maintain your licenses.
This tool is not for registering your licenses, and its purpose is to manage your keys and to deregister a license key if the theme has been removed from your server.
If you want to register or deregister the installed theme you should do that in your WordPress dashboard>betheme>dashboard.
Muffin Support Team