https://support.microsoft.com/en-us/...ng-home-to-pro

Upgrade using a Windows 10 Pro product key To upgrade from Windows 10 Home if you have a Windows 10 product key:

  • Select the Start button, then select Settings > Update & security > Activation.
  • Select Change product key, and then enter the 25-character Windows 10 Pro product key.
  • Select Next to start the upgrade to Windows 10 Pro.