Upgrade to Windows 10: FAQ - Microsoft Support
http://go.microsoft.com/fwlink/?LinkID=617350
WEBAn upgrade moves your PC from a previous version of Windows—such as Windows 7 or Windows 8.1—to Windows 10. An upgrade can take place on your existing device, though Microsoft recommends using Windows 10 on a new PC to take advantage of the latest features and security improvements.
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