Youtube stop doing this because people would pause a Multi-Hour long video (such as a music video) download the entire thing, only to then only watch 15 minutes of it because that's the bit they wanted. Massive waste of bandwidth
What's going on with YouTube video downloading? Any route I take to try to download, it only gives me the option of 1080p video only and a different option for audio only. I've recently downloaded a couple of videos my kids watch for offline use and I had to put the downloaded files into a video editor to combine the audio and video myself.
If you ever find yourself combining audio and video again, check out mkvtoolnix. In this situation, a video editor is overkill and potentially transcodes the audio or video, taking an hour. This tool is basically winzip for video files, it lets you swap audio and video tracks around in a few seconds.