1. Open Powershell window as an admin
  2. Remove Windows WSUS Feature

Uninstall-WindowsFeature -Name UpdateServices,Windows-Internal-Database -Restart

3. Post restart, delete EVERYTHING in the C:\Windows\WID\ (for Win 2012 r2) folder.
4. Remove the files inside the WSUSContent

5. Then run the following command to re-install WSUS:

Install-WindowsFeature UpdateServices -Restart

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