>>7101820Well, it's not easy to do. But even I could do it. Basically, if you have youtube-dl, you need to get an addon to extract the cookies for three website related to google and yt, then convert them with a software into an older format which youtube-dl can use, and then run yt-dl with the command --cookies and it works like a charm.
here's a link to how to do it:
https://daveparrish.net/posts/2018-06-22-How-to-download-private-YouTube-videos-with-youtube-dl.html 