And a few hours later it was fixed [1], although I don’t think a new version has been released yet.

If you happen to use uv [2] you can run the latest yt-dlp from GitHub like this (yes a username and password seem to be required now).

uvx git+https://github.com/yt-dlp/yt-dlp --username “[log in to unmask]" --password “my-excellent-password" https://vimeo.com/831229281

[1] https://github.com/yt-dlp/yt-dlp/issues/13822
[2] https://docs.astral.sh/uv/getting-started/installation/ 

> On Jul 23, 2025, at 6:11 PM, Ed Summers <[log in to unmask]> wrote:
> 
> Weird! As I noted in the Github issue [1] I just tried the latest code from Github as well as the last release 2025.07.21 and it didn’t work. Which video were you downloading? 
> 
> //Ed
> 
> [1] https://github.com/yt-dlp/yt-dlp/issues/13822