This works 99.999% of the time. The 0.001% is every time YouTube tries to break the extension - the author has been genuine and brought these changes to users' attention.
There is literally no downside, any 1-star review is from people that don't understand why this doesn't work 100% of the time.

If you'd like a youtube downloader that nearly always works; and when it doesn't, you get an explanation. Then this is what you're looking for.