I shut down my website that was using BeTheme. I went to install the theme on another url but I get a warning that the theme is already registered on another site. How can I get unregistered from my old site which no longer exists?
I believe you can contact the author and have them deactivate the previous license so you can use it on your new site.
You can contact with your purchase item author @muffingroup right here as a comments hope they will help you out from your issue