Streamfab uses a modified version of yt-dlp to download videos and in the past few days Dailymotion has made changes to their site which has broken yt-dlp. All downloaders which are based on yt-dlp, which includes Streamfab, are currently broken for Dailymotion. There are two current workarounds - use the browser addon VideoDownload Helper, as someone else suggested, or use yt-dlp.exe at the command prompt with the option “–impersonate chrome”. That is:
prompt>yt-dlp --impersonate chrome https://www.dailymotion.com/video/....
If you want to download DM pro stuff, you’ll need to add in your login details:
prompt>yt-dlp --impersonate chrome -u <user> -p <password> https://www.dailymotion.com/video/....
I assume that’ll work, but I don’t have a pro account, so can’t confirm. I successfully used the first example to download some stuff yesterday … however the download speed is very slow, between 1-2x viewing speed (and that was on a very fast internet connection). If you want the technical details for what’s happened, check the discussion on the yt-dlp GitHub site (https://github.com/yt-dlp/yt-dlp/issues/15526).
The yt-dlp devs are working on a fix and hope to have it added to the stable release in the near future. We then have to wait for SF to catch up and they are usually several versions behind with yt-dlp, so it might be a while unless they can utilise the “–impersonate chrome” option.