Here’s how to download 360 videos from YouTube in equirectangular format.
If you need to download your 360 video from YouTube, you may find that the video is broken up. That’s because YouTube is using the equiangular cubemap (EAC) format, like this:
Equiangular cubemap is a projection developed by Google for 360 photos and videos that is more efficient than the standard equirectangular projection, which is why it is used by YouTube and incidentally, it is also used by the GoPro MAX (reviewed here). However, equiangular cubemap format is not yet widely supported. (As of February 2020, it can be played in After Effects and GoPro VR Player.)
360 Tips and Tricks posted a video tutorial that shows how to download 360 videos from YouTube in standard equirectangular format, which is supported by almost all 360 video players:
Please follow copyright laws. Do not download videos without permission.
Please note also that I have not tested the software that 360 Tips and Tricks used. I don’t know if it has malware or any issues. Use the software at your own risk.