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Windows software licensing user interface tool

Problem: I was not able to activate Windows 2016 server standard using product key from settings --> Activate Windows now option. Every time I launch the window for providing the correct key, it will try to activate the windows and change product key would grey out.

 Solution: The easiest way to provide the key for activating windows is to use the software licensing user interface tool. It is a command line utility tool that can be launched from run command. Type slui.exe in the run command and provide the correct key in the text box available from the user interface of the tool.

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