Downgrade from Windows 7 Ultimate to Home Premium?

windows-7 windows 64-bit product-key downgrade
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You need a disk for doing this. Google for digital river windows 7 iso and download the ISO, use a tool called ei.cfg Removal Utility to change the ISO to Home Premium.

Now run the Tool Windows 7 Downgrader (read the comments there for special steps on 64bit systems),

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click on "Downgrade to Home Premium", insert the Windows 7 DVD and do an Inplace Upgrade/ Repair Installation:

  • In the running Windows 7, mount the ISO or insert the DVD
  • Run setup from the DVD and select "Upgrade"

This downgrades Win7 Ultimate to Home Premium.

NOTE: This is not officially supported by MS, but it works.

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Isserlis
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Isserlis

Updated on September 18, 2022

Comments

  • Isserlis
    Isserlis almost 2 years

    A few months ago, I acquired a Windows 7 Ultimate product key and updated from Home Premium to Ultimate. Well, now I get the "This copy of Windows is not genuine" message. I have the Home Premium product key that I was using before I upgraded to Ultimate. I would want to know how I could downgrade from Ultimate to Home Premium without having any CD and only the product key. If it helps, it's a 64-bit OS. Thanks in advance!

    • kinokijuf
      kinokijuf over 11 years
      How did you “acquire” the key?

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