Hey all,
I installed Windows 10 1903 for my girl friend on a new computer on 2019-06-02.
I installed it with an usb drive created by the media creation tool (https://www.microsoft.com/de-de/software-download/windows10).

She tried to open the game "The Sims 3" from Origin. But it failed to start showing an error.
The error has the code 0xC0000135. After some research I found out that the .NET Framework is missing.
So I tried to install .NET with optionalfeatures.exe. There I can find the features ".NET Extensibility 4.8" and ".NET Extensibility 3.5" and ".NET Environment". When I tried to enable them, the feature installer finished the installation without an error.
But when I open optionalfeatures.exe again, the features are unselected.

My last idea was to open powershell.exe and to install the features with the Install-Feature command let. But when I tried to open PowerShell I got an error that mscoree.dll is missing. So I can not use powershell.

I tried to uninstall the update KB4495620 and to run the command "DISM /Online /Add-Capability /CapabilityName:NetFx3~~~~". But it failed.
I also tried the command "DISM /Online /Add-Capability /CapabilityName:NetFx3~~~~ /Source:E:\Sources\sxs" and it failed again.
Do you have an idea, how I could fix the issue?
Greetings from Hamburg, Germany :-)