This error typically occurs when the registration server does not recognize the license ID for that particular version of the plug-in. There’s a possibility that the license ID you are providing may have some extra characters. Please type in the license ID manually as shown (including the dash/hyphen) and try again.
Another possibility is that you are trying to register a different version of the plug-in than the version that’s attached to the license ID. Please verify that you have the proper version of the plug-in and try again.