same thing is affecting me, and it has not cleared up yet. I think this is some sort of gating policy put in by SE to combat their congestion problems.

I will download ~1400MB of the ~2500MB 8.10 patch and then it will switch to updating and then go to a black screen with the exact same error that is described by the OP.

It has done this since phase 4, early access, and now continues through release.