On some versions, you can simply click Restore Purchase , enter the email used at checkout, and follow the prompts to sync your status. Recovering a Lost License Key
Open your browser and click on the Video DownloadHelper icon. Navigate to the Settings (often represented by a gear icon). downloadhelper license key upd
Look for the Licensing or Premium tab.
If you already own a license but it isn't appearing as active after an update, you can manually re-register it: On some versions, you can simply click Restore