It seems youtube changed an @ and this has broken everything.
The error is:
"[youtube] Downloading login page
[youtube] Looking up account info
WARNING: Unable to look up account info: HTTP Error 400: Bad Request
[youtube] hePrs5TyE0A: Downloading webpage
ERROR: Unable to extract uploader id; please report this issue on https://yt-dl.org/bug . Make sure you are using the latest version; type youtube-dl -U to update. Be sure to call youtube-dl with the --verbose flag and include its complete output."
It seems youtube changed an @ and this has broken everything.
The error is: "[youtube] Downloading login page [youtube] Looking up account info WARNING: Unable to look up account info: HTTP Error 400: Bad Request [youtube] hePrs5TyE0A: Downloading webpage ERROR: Unable to extract uploader id; please report this issue on https://yt-dl.org/bug . Make sure you are using the latest version; type youtube-dl -U to update. Be sure to call youtube-dl with the --verbose flag and include its complete output."
However, it appears the underlying issue has already been found. (An extra @ in the userid) https://forum.videohelp.com/threads/408650-No-longer-able-to-download-videos-with-youtube-dl-exe#post2681508 https://github.com/ytdl-org/youtube-dl/issues/31530