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I upgraded by simply going to the Microsoft Store (accessible from the START menu). The cost is $99 plus tax. The change / upgrade after the purchase only takes a few minutes after a medium size download from Microsoft. Please reference the Microsoft support article at https://support.microsoft.com/en-us/help/12384/windows-10-upgrading-home-to-pro
Sorry, there was a problem. Please try again later.Once you are logged into the computer and up-and-running, you can upgrade any version of windows once it is verified as authentic. Follow these instructions. To open it, open the Start menu or Start screen and select “Settings”. Select “Update & security”, and then select “Activation”. You'll see the edition of Windows 10 you have displayed here. To upgrade from Windows 10 Home to Windows 10 Professional, click or tap the “Go to Store” button in the Activation pane. Source: https://support.microsoft.com/en-us/help/12384/windows-10-upgrading-home-to-pro
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