We see many posts of problems with games purchased from the Windows Store.
We have seen many problems with the Windows Store as Microsoft has had issues galore without adequately testing it.
There are a few steps that can be tried to fix the problem. None of them require any advanced technical skill.
Make sue you have an administrator account to use these fixes.
First try the Windows Troubleshooter which can check everything from the Windows Store. Open up the settings and the troubleshooter is at the bottom of the list.
RESET THE STORE CACHE
You can reset the Windows Store cache with the Win+R and enter wsreset.exe which will execute the reset command, Make sure you run this as an administrator.
FIX WINDOWS UPDATE
The last step is to fix Windows lower level systems. See the page on Fix Windows Update.
You probably should consider reset this PC as it is clear there are problems not easily fixed.