You should be able to take care of this yourself. Click this:
https://groups.google.com/g/video-downloadhelper-q-and-a/c/BzPLK2YyL-s
You'll probably want to bookmark that for easy reference. I recommend you read the whole
thread, if not now, eventually. As you read through the thread you will come across
instructions for unlocking your license yourself. You can skip quickly to those
instructions by doing a string seatch on "revalidate" in there. That should fix you up.
Do post again to tell us how you get on with this. Do that with the Reply all button.
DO NOT USE the Reply to author button. The way to continue a conversation here is the
Reply all button.