Upgrade Windows 10 Home to Windows 10 Pro

From your Windows 10 Home running Version 1511, enter the Windows 10 Pro Default key under change product key.

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This default key will not activate the system, just take you to Pro so you can activate using a valid Pro key that you will provide.

Once you have done this, the system will go through an upgrade process from Home to Pro, but will not be activated on Pro.

You will require a genuine product key to then activate Windows.