Can't update theme on the new version
and can't update Slider Revolution that is why now it is not displaying on site
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 a couple of times (usually, it passes after 2-3 attempts) - remember, all of the plugins have to be disabled.