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You can download all the videos from here https://archive.org/details/MIT6.046JS15 . Available as torrent too.

or use youtube-dl on the youtube playlist

Here is the command for downloading all videos in playlist at 720p in a folder with the same name as the playlist's

youtube-dl -o "%(playlist)s/%(playlist_index)s. %(title)s.%(ext)s" $YTplaylistLINK -f 22

Thanks for sharing! I'm trying the following, but it's not working.

youtube-dl -o "%(playlist)s/%(playlist_index)s. %(title)s.%(ext)s" https://www.youtube.com/playlist?list=PLUl4u3cNGP62K2DjQLRxD... -f 22

What is the correct format?

Working! Thank you :)

thanks.