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Note that for the RTM version of Windows 8.1 you cannot use the preview product ID. If you don’t have one you will not be able to proceed.

Next, you will need to enter a valid product ID.

Next, you will be prompted to perform a Windows Update.

The Install Windows dialog box will appear as shown below. If it is an ISO file, mount it and then wait a couple of seconds for autorun to start on its own (or you could start it yourself).

To get started you need to place the Windows 8.1 media in the DVD drive.

You will need to re-install your computer with the previous OS from a recovery disk or from the original media provided by the manufacturer. Note that once you perform the upgrade, you will not be able to uninstall or revert back to your previous version of Windows. Reverting to Previous Versions of Windows

See the following Technet article for a complete list: Windows 8.1 – What’s New, IT Pro Features, Devices, UI. The list of new and upgraded features in Windows 8.1 is beyond the scope of this article. Laptop notice: If you’re using a laptop, I would strongly suggest that you plug it to a power adapter before you start the upgrade process.

It runs Windows 8 Enterprise edition and it was fully updated prior to the upgrade process. This article is a complete walkthrough on the steps taken when upgrading a Windows 8.1 installation from Windows 8.įirst, we start with a sample demo machine I created for this demonstration.