I use youtube-dl. It's a quick command line program. Lot of options, really fast, easy, and open source.
If you have Python, there's a command line program called youtube-dl. http://ytdl-org.github.io/youtube-dl/about.html
Viddly works
I use a download manager called IDM Internet download manger. Works on all kinds of pages that have videos. It's integrated into the browser. Easy to use.
Looks like YT changed to XHR Fetch. Can't even do it through Developer Tools anymore. And Video DownloadHelper doesn't work in Chromium-based browsers (they disabled it - it's still available for Mozilla browsers).
VLC player can do it. Also, newpipe mobile app.
That's what I used to use (not sure if you read the text inside the post), but it stopped working. Granted, I keep ignoring the prompt to update VLC...
Youtube-dl
Its not user friendly and it has a ton of advanced options which I don't understand, but it gets the job done.
(post is archived)