Getting an error asking which app to use to install? This might help
You need to do "Get-WindowsFeature". I had the problem that powershell wasn't recognizing the Install-WindowsFeature and kept asking which app to open the updates with.
https://technet.microsoft.com/en-us/windows-server-docs/management/server-manager/install-or-uninstall-roles-role-services-or-features
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