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How To Download Windows 8.1 ISO File Using Windows 8 Product Key (Update)

Microsoft has released Windows 8.1final version and it is available for free via the Windows Store to all current Windows 8 users. Only you need to visit the Store and start upgrading it. As there would not be an ISO release for Windows 8.1 like the previous Windows 8, you can’t upgrade it using the ISO file

However, if you already have purchased Windows 8.1 or Windows 8, Microsoft provides an option to upgrade using the Set up assistant. Using it, you can download the Windows 8.1 ISO file to your PC and manually upgrade using it. Here is how to use it.

- Go to Microsoft's page and download both Windows8-Setup.exe and Windows8.1-Setup.exe files.

- Run the Windows8-Setup.exe file and enter your Windows 8 product key when prompted. Continue the setup process until it begins downloading Windows 8.

- Now, quit the Windows 8 setup window and run the Windows8.1-SetupBox. It’ll begin downloading the Windows 8.1 ISO. It will take several times depending on your connection speed.

Once the download is complete click next. You will get three options – Install now, Install by creating media and Install later from your desktop.

To save it as ISO, select Install by Creating media option and click next. In the next screen select ISO file option and click save option.

Now, the set up will create the ISO file for Windows 8.1 on the location where you have specified. You can burn this ISO to USB drive or DVD and manually upgrade your Windows 8 PCs to Windows 8.1.


  1. Great little article.
    I have done just this. The files are in the folder c:/ESD/Windows/ which is hidden BTW.
    I also added in the file ei.cfg to fhe souces directory telling it to install Windows 8.1 professional so I only have to put in my Windows 8 pro key after installation but during activation.

    If you burn to a DVD it is also possible to install to an MBR disk on a PC with an EFI bios.


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