How to find link to video file from URL

[snippsat]

You most

Did you update anything to make it work on your side ?

You may have updated the version then the working arte.py will be overwritten.
Follow way post #12
Also copy file arte.py an overwrite the original one in your environment.

Test of the new version.

G:\1_youtube
λ python -V
Python 3.10.5

G:\1_youtube
λ python -m venv new_env

G:\1_youtube
λ cd new_env\

G:\1_youtube\new_env
λ G:\1_youtube\new_env\Scripts\activate

(new_env) G:\1_youtube\new_env
λ pip install -U yt-dlp
Collecting yt-dlp
  Downloading yt_dlp-2022.6.22.1-py2.py3-none-any.whl (2.6 MB)
  .....

(new_env) G:\1_youtube\new_env
λ yt-dlp https://www.arte.tv/en/videos/104840-002-A/42-the-answer-to-almost-everything/
[ArteTV] 104840-002-A: Downloading JSON metadata
ERROR: [ArteTV] 104840-002-A: Unable to download JSON metadata: HTTP Error 404: Not Found (caused by <HTTPError 404:
'Not Found'>); please report this issue on  https://github.com/yt-dlp/yt-dlp/issues?q= ,
filling out the appropriate issue template. Confirm you are on the latest version using  yt-dlp -U

So they have not updated the new version,so you most use the hack as described before.