The best way that I can think of to download and convert YouTube video to Mp3 is Wondershare UniConverter. It’s my very YouTube video downloader to download 4K and even 8K videos as well as the whole channel.
I would recommend checking out a program called 4K Video Downloader. You just have to copy and paste the URL into it and it will download the video. If you just want the MP3 file from it you can check a box to have it automatically convert to an MP3 file as it downloads.
