It doesn't matter if you're upgrading from Windows 8, Windows 8 Pro, or Windows RT, or one of the preview versions of the operating system. The process of upgrading to Windows 8.1 or Windows RT 8.1 is exactly the same. However, the problems and errors you encounter may vary from device to device.
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How to uninstall Windows 10 and go back to Windows 8.1
Anyone running Windows 8 will receive a notification in the Windows Store. Click Download and the upgrade to Windows 8.1 will begin. After a few reboots and OOBE setup, you're good to go.
Although the upgrade process is the same, the result is slightly different if you are using Windows 8.1 Preview because you will have to reinstall all your applications after the upgrade, which is not the case with Windows. For more information on this topic, see the Windows guide: How to upgrade from any operating system version to Windows 8.1 final. All the basics are covered there.
In the actual step-by-step process, you need to do the following:
