Are you a previous Extendd.com customer? Did you download the new version of your plugin and the Frosty Media license manager?

If you previously had activated your license for your plugin and in the new license manger page the license key didn’t show up but you re-entered it and it won’t activate, you’ll have to login to your account here and visit your activate licenses and deactivate that site in able to re-activate via the new license activation page.

How to deactivate your License Key