Extension "video download helper" seem like work, but need companion app (tried with first movie popped up).
To bypass network monitor detect (they close page if open): open uBlock Origin request logger. Play media. Look for last few loaded request, copy url, download using yt-dlp.
If fail, maybe need use curl/wget/aria2 and manually copy header value. I think used "http header live" extension to see network log with header without use network manager (uBlock not show header).
Edit: if all other site not show this episode, maybe consider make torrent for other who search and not find