1. Go to HCU\Control Panel\Desktop
  2. On the right pane, double click on PaintDesktopVersion
  3. Change the Value data to 1

Reference:
https://answers.microsoft.com/en-us/windows/forum/windows_vista-desktop/how-to-display-windows-version-as-watermark-on/97b95ae2-20ac-4159-b673-dab89c8ce28e

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