You could always use yt-dlp to download from tubi. yt-dlp is a command line (aka dos or terminal) application. At the most basic, put it in a folder and open the command prompt in *that* folder and then type something like:
yt-dlp https://tubitv.com/tv-shows/443847/s01-e01-mr-bean
I just tried that video (random choice) and it downloaded fine. You get the url from the tubi website. SF's issue ATM would appear to be in analysing and getting the downloadable link, not the actual download. If you are not comfortable using a command line program, then there are plenty of GUIs out there for yt-dlp. Run the GUI, plug in the url from the tubi website and the file will download.
yt-dlp is also available for windows, mac and linux. It'll download any video that's not DRM protected and even then it actually can download DRM videos, it just won't decrypt them.