Developers frequently blacklist leaked keys. A key that works today will likely result in a "Key Blocked" message after the next extension update.
: Open any YouTube video page. Look for the "Download" button added by the extension and click the option in the dropdown menu. Enter Your Key : Paste your payment email address into the "Activation Key" field. Ensure there are no leading or trailing spaces. Save and Refresh : Click "Save Settings" and refresh the YouTube page . The 1080p and 256kbps MP3 options should now be active. Is it Safe and Legal? Easy Youtube Video Downloader Express Easy Youtube Video Downloader Pro Activation Key