Well Microsoft Store now seems to be completely Broken...This leaves me in a helpless state...My MSFS broke and I could do nothing with it so I un-installed it and then tried to Download and re-install it but nothing will respond now and I fear I have wasted much time and money on an unreliable Flight Sim!...I'll just leave it now and try to forget I ever had a Flight Sim!
Sorry to hear of this Peter, are you able to post something on one of their forums that might be of help to you?
If you cannot get any help then it would be a shame for you to give up virtual flying altogether as you really enjoy it, maybe if you considered going back one step to the sim you were familiar with whether it was FSX or P3d or even try the demo version of X-Plane 11, granted the stock scenery is just basic and nothing to shout about but with the True Earth sceneries it makes it so much better and also you can installed just the countries or rather areas you want to fly in and leave the rest out.
If you choose X-Plane then don't go for the Steam Version as any updates will come after the one from X-Plane itself. You can also download many free-ware a/c to use as well whilst you try it out.
https://www.x-plane.com/desktop/try-it/
This is only a suggestion Peter if you cannot find a way to re-install MS2020 but would think that somebody here may be able to help you.
Regards
Nigel.
I used to be an optimist but with age I am now a grumpy old pessimist.