Appendix A. Install or upgrade to Windows 10

Microsoft has generously offered free upgrades from the Home and Professional editions of Windows 7 with Service Pack 1 (SP1) and Windows 8.1 to the same editions of Windows 10. At the time of this writing, the free upgrade offer is valid for one year from the official Windows 10 release date of July 29, 2015. More information about the upgrade offer is available at www.microsoft.com/en-us/windows/windows-10-upgrade.

If your computer is running a licensed copy of Windows 7 SP1 or Windows 8.1 with all the available system updates installed, you should receive an invitation to upgrade through Windows Update.

A friendly invitation to upgrade

There are four editions of Windows 10: Windows 10 Home and ...

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