MediaHuman YouTube Downloader 3.9.8.25 (1006) | macOS | 29 mb
There are so many interesting things to be found on YouTube, but you can't download the videos or save them as audio files. That is why we developed YouTube Downloader. This app will help you to accomplish video downloads quickly and without hangups. Using our program you can simply download a whole YouTube playlist or channel and watch it whenever and wherever you want.
Homepage: http://www.mediahuman.com/youtube-downloader/
Compatibility: OS X 10.8 or later 64-bit 
TO MAC USERS: If RAR password doesn't work, use this archive program:
RAR Expander 0.8.5 Beta 4 and extract password protected files without error.
TO WIN USERS: If RAR password doesn't work, use this archive program:
Latest Winrar and extract password protected files without error.
