Does the free version work? or do you have to get the paid version? I see a tool similiar to this - Freemake - but not sure if it's legit4K Video Downloader | Free Video Downloader for PС, Mac and Linux
I bought the full version so I can download playlists. I mostly use it for video so I can get shit for my kids and toss it on plex so they can watch it on TV, but it works equally as well for getting MP3.