Yeah, just stumbled across that.
Video DownloadHelper a blast from the past. Haven't used that for more than a decade (I discovered youtube-dl and never looked back).
I didn't look further in my testing, only promted me for a license when a wanted to download only audio, which seemed kinda scummy since there isn't even a pure audio source on the website as far as I can tell.
yt-dlp (the most up-to-date version of youtube-dl) has hundreds of supported websites.
The generic downloader can download from unsupported websites most of the time and if that doesn't work you just paste in the m3u8 file as seen in my answer.
That's what I found and am struggling with RIGHT NOW!
It seems that If I had Firefox it would work straight away. But I run Waterfox, and it doesn't work. Trying to figure out where to move the install files into Waterfox... Hmmm...