youtube-dl ( https://yt-dl.org ) is a great tool to download videos from youtube and other sites (twatter, news sites, etc). It's on the command line, though.
youtube-dl "https://www.youtube.com/watch?v=VI8onTIu-F0"
Thank you very much
This is totally my preferred choice. Just be sure to update it often (sudo youtube-dl -U on Linux) as YouTube likes to break things often for tools like this.
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