.NET Core suddenly required after windows update but not detected?

I just installed windows updates on our server last night and now launcher won’t run on it. “To run this application, you must install .NET Core.” I installed it and it still doesn’t run. Same error.

Progress. Running RCS from command line:

"A fatal error was encountered. The library ‘hostpolicy.dll’ required to execute the application was not found in ‘C:\Porgram Files\dotnet’

Reinstall was only way I could figure out to correct.

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