In order to use your previously installed plugin on another website, or on the same website having another domain name, it is required to change the domain affixed to the granted license.
In order to do so, you need to deactivate the existing license in Global Settings of the plugin before transferring the plugin to another website (or the whole website to another domain).
After activating the plugin in the new website’s admin panel, you must enter the license key from your account once again.