I used to use a YT downloader, but not in ages. However, I did see one of my saved articles from ItsFOSS from last year on the steps for using it.
I think the only things I ever had isses with in using an extension in a browser was maybe some copyrighted movies, etc. And “no” I have never paid for YT or any Google services.
Maybe try it and let us know.
Sheila