I just changed the main domain from .com to .de and now I am not able to update be theme anymore. (see screenshot enclosed)
Can you help me with that? This is the website: https://www.gala-bau-schneider.de
This message could mean that your license key is used on more than one domain. Please use the license manager to handle your license keys: http://forum.muffingroup.com/betheme/discussion/36219/cannot-register-deregister-your-license-key-use-this-tool#latest.
If you see (on our license manager) that your license key is registered on a single domain, then please disable all of the plugins and deregister that license key (through the BeTheme -> Dashboard).
After that, get into the license manager once more. If the license key is still claimed - deregister it. If it’s not, register it again on your domain (through the BeTheme -> Dashboard) and try to update your theme/plugins couple of times (usually it pass after 2-3 attempts) - remember, all of the plugins have to be disabled.