iTubeGo YouTube Downloader: Download and convert videos to MP3, MP4
Amazon.com: Video and Audio Downloader software for YouTube – download your favorite YouTube videos as MP4 video or MP3 audio – lifetime license – computer program compatible with Windows 11, 10, 8 and 7
How to download free MP4 videos from the Internet
HitPaw Video Converter - How to Convert MP4 to MP3 - YouTube