How to Download all Videos from a Playlist of a YouTube Channel

First of all, get hold of the command line app yt-dlp.

And then locate the playlist’s URL, usually, it looks something like: https://www.youtube.com/playlist?list=PLHRPVO3iI3UuJOfesVfvaJf4F9DKteewJ

Last, but not least, kick off a command line terminal window (either Windows or Linux) and execute the below command:
yt-dlp -i --yes-playlist https://www.youtube.com/playlist?list=PLHRPVO3iI3UuJOfesVfvaJf4F9DKteewJ