I have tried disabling all plugins and then updated the slider revolution plugin, but it failed. Here is the screenshot for reference:
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.
Thank you for the helpful solution. I tried it and the slider revolution update was successful.