If your computer came with Windows 8.1 already installed on it, you can skip this appendix—for now. But if you’re running an earlier version of Windows and want to savor the Win8.1 experience, this appendix describes how to install the new operating system on your computer.
If you want to upgrade from Windows 8 to Windows 8.1, that’s a pretty minor operation. It’s described at the end of this appendix. Most of these pages describe the upgrade from Windows XP, Windows Vista, Windows 7, and so on.