I am trying to use the license on the new version of the same site, but I am getting a message
The limit for the amount of sites the theme/plugin can be enabled on has been reached.
This means you have already used the entered license key on two other WordPress installations. This issue is related to Envato/CodeCanyon products of us. You now have two possibilities to fix this error:
You log in to one of the two WordPress installations and navigate to Plugins and scroll to the plugin (e.g. Real Media Library). There you open the “License settings” and “Deactivate” the license key. Attention: You will not get anymore automatic updates on this WordPress installation.
You can no longer access that WordPress installations? That shouldn’t be a problem, please open a support ticket here with your license key, and we will reset it for you.