I think Microsoft has a lot to do to solve those problems. And they must do it quickly. We have all paid for the game.
So I am waiting for a patch from them which solves all the problems.
Unbelievable
I slept on the problem and this morning started up the flight sim. I got that same error message but on studying the page..... over in the top right is a 'Refresh' icon. I clicked on that and hey presto. The download installed!!!!!
WHY?????
Why get an error message that can be corrected simply by refreshing the page?
Oh well life's too short to worry about solvable problems