Yes, i do that not every day, so i was afraid the MSFS will be installed there, but it was only the installer.
The MSFS itself is now correctly installed.
I actually just have the same problem as well.
I was always able to install MSFS directly from MS-Store. Now I suddenly have to download the Xbox.
Why?
A few months ago Microsoft has changed the procedure for installing and updating too.So,you must do that with the xbox app.You may do a search in the forum using the “search” icon on the top of the screen to find many posts on this regard.