I really believe the developer of this addon works diligently to keep this addon working on YouTube. The thing people need to remember is that sometimes YouTube will make deliberate changes in the hopes of breaking this addon to keep you from downloading videos. This developer seems to be working hard to make bug fixes to overcome YouTube's subtle sabotage attempts to break this addon. Kudos to the developer!!

(FYI: I donated on 5/5/23 to support further development/maintenance on this addon [thumbs up])