FWIW the youtube-dl daily builds still work with YouTube as well. They're what I'm using. They can be downloaded with "get_youtube-dl.sh youtube-dl_daily", or for those who prefer to set things up manually:
(Sorry Rich, using code tags around (or any text under) this command causes a forum error (what exactly does it take to make CentralWare turn mod_security off, I wonder...)).
wget https://github.com/ytdl-patched/youtube-dl/releases/latest/download/youtube-dl
[Edit]: Added code tags. Rich