Yep, working for me too now. I didn't do anything, other than exit and re-start StreamFab for unrelated reasons (I tried that 2 days ago without success). Unfortunately, I don't remember what I was trying to download 2 days ago.
I should add that I am still using 6.2.1.9. I downloaded 6.2.2.0, but after reading the other threads decided not to install it. Version 6.2.1.9 is working fine for me, downloading Amazon, Disney+, Roku Channel, and occasionally Tubi.