Love the continuous update feature. Works very well for my purposes.

For those that have complained this product fails, the fault is not with the program but with the constant -- often unannounced -- changes to YouTube. I've experienced issues from time to time, also.

My suggestion:
1. Update your extension to the newest version. Force the update by going directly to the extension in your browser, click SETTING and look for the CHECK NOW (or similar button) to force a version check and force the update download.
2. Make sure your browser is current and updated to the latest version with all patches.
3. Check to be sure your browser's update didn't turn off the extension. If this happens, reactivate the extension.
4. If you've done #1 and #2 and the video still won't download, try closing out ALL browser windows (Use Task Manager to kill all browser sessions), then restart the browser.
5. If all e;se fails, shutdown all browser sessions (as per #4), then do a "cold boot" of your computer. That is SHUTDOWN the PC completely (not a reboot), then restart the computer.