Install Windows 8.1 without a Product Key (Skip Key Input)

windows 8 logo iconSo you’ve got a Windows 8.1 ISO, but it is not letting you start the installation before inputting the product key? This is because Windows setup finds out which version to install from the Product Key and hence product key is needed before proceeding with the installation. But what if you want to install and trial Windows 8.1 before purchasing? You can easily force the setup to skip the Product Key check and proceed with the installation.

Skip Product Key Input in Windows 8.1 Setup

To achieve our objective, we need to edit the ei.cfg (edition configuration) file present inside the /sources folder of the ISO image. All we need to do is to provide the version details inside this file so that Windows Setup is not needed to ask for a product key to install the appropriate version relevant to that product key.

  1. If you are going to install Windows 8.1 using a USB drive, transfer the installation files to the USB and then proceed to step 2. On the other hand if you need to create a DVD, open the ISO using a utility such as MagicISO so that the structure is not affected.
  2. Browse to the /sources folder.
  3. Look for the ei.cfg file and open it in a text editor such as Notepad or Notepad++ (preferred). If the file doesn’t already exist, create a new text document and rename it as ei.cfg
  4. Now amend the file depending on the version which is included in your particular copy and the version which you want to install. For Professional edition which will be the best bet for most of the users, paste the following context into the ei.cfg file. Make sure that anything that already exists in the file should be cleared first.
  5. Save the file and run the Windows 8.1 setup again. The setup will not ask for the Product Key anymore.
This is not a hack or anything illegal. The configuration above is supported by Windows installer and is well documented by Microsoft and can also be used on some other versions of Windows as well.
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146 Responses to Install Windows 8.1 without a Product Key (Skip Key Input)

  1. Anjan Das May 19, 2015 at 12:37 pm #

    I have a lenovo b40-45 laptop, it has UEFI bios, i am trying to install win 8.1 but its not installing. How can i get a UEFI compatible Win 8.1

  2. David May 19, 2015 at 12:44 pm #

    What do i enter after [EditionID] if I have a version of windows 8.1. not Professional?

    • Narender Singh May 19, 2015 at 4:06 pm #

      From the official documentation – {Edition ID} must be a valid Windows edition ID, for example, “Enterprise”. To obtain the current EditionID, use the Dism /Get-ImageInfo command or the Dism /Get-CurrentEdition command.

      • Narender Singh May 19, 2015 at 4:08 pm #

        Also, you can leave the EDITIONID blank for Windows to prompt which edition you want to install.

  3. Chrish Singh June 10, 2015 at 7:10 pm #

    While i am going to install window 8.1 in the instalation it asking the product key and after entering the product key the massege coming that your window licence term arangement is not valid so you have to reinstall the setup so plese slove my problem imediately
    it,s window ( WindowsBlue-ClientwithApps-32bit-English-X1899604) window 8.1 provide me key also

  4. Azhar June 16, 2015 at 3:13 pm #

    I use this method but err came “the product. Key interest does not match any of the widows image available for installation. Enter a different product key

    • Narender Singh June 16, 2015 at 10:27 pm #

      Please edit the file to include your edition of Windows.

  5. Ezra Dube June 23, 2015 at 5:04 am #

    i’ve created a new text document but it won’t fit on the disc

    • Narender Singh June 23, 2015 at 9:05 am #

      You cannot write new files to a disk. You should either choose USB installation or edit the ISO to include the ei.cfg file and then burn it to DVD.

      • josh July 1, 2015 at 3:39 pm #

        i have done what you said on the flash disk but it is still requesting product key

        • Narender Singh July 1, 2015 at 10:10 pm #

          Are you sure you saved the file as cfg file and not a text file? Check the file properties again.

  6. sumit July 3, 2015 at 4:52 am #

    no ei.cfg file in entire USB

    • Narender Singh July 3, 2015 at 4:20 pm #

      As said, you gotta create it if it doesn’t already exist.

  7. jansi July 3, 2015 at 3:33 pm #

    please anybody send me windows8.1 pro product key

    • Narender Singh July 3, 2015 at 4:02 pm #

      And why would somebody share his product key with you?

  8. nidheesh July 5, 2015 at 6:08 pm #

    bro i need windows8.1product key plz help me

    • Narender Singh July 5, 2015 at 7:03 pm #

      You need to purchase one, buddy.

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