Cheap Windows 8.1 Professional Key Purchase How to Use Windows 8.1 Professional Key

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How to Perform a Clean Install of Windows 8.1

Windows 8.1 is a free upgrade for all Windows 8 users, but Windows 8.1 is usually not installed using Windows 8 product keys. Fortunately, you can bypass this limitation if you really want a fresh install of Windows 8.1.

Microsoft also only allows you to download Windows 8.1 installation media with Windows 8.1 keys, so we’ll show you another trick that allows you to download Windows 8.1 installation media with a valid Windows 8 key.

Update! Microsoft Makes it Easier

If you only want to download the installation media to reinstall Windows 8.1, Microsoft has a new option that lets you download the image without entering a product key. If you completely reinstalled your Windows 8.0 PC, you can use this 8.1 installation media in Windows 8.0, so there is no reason not to do so. It even integrates with Update 1.

Just download the Windows Installation Media Creation Tool and select the details of the version you want (Windows 8.1 or 8.1 Pro, etc.) and follow the wizard to create the boot media.
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You can choose to place the boot media directly on the USB drive, create an ISO for later use, or burn the disc later.

The Problem and How to Solved It (Old Version)

The problem is that the Windows 8.1 product key is different from the Windows 8 product key. You can not enter a Windows 8 product key into the Windows 8.1 installer just as you can not enter a Windows 7 product key into the Windows 8 installer. You also can not install the original version of Windows 8 using a Windows 8.1 product key.

The problem is that the Windows 8.1 product key is different from the Windows 8 product key. You can not enter a Windows 8 product key into the Windows 8.1 installer just as you can not enter a Windows 7 product key into the Windows 8 installer. You also can not install the original version of Windows 8 using a Windows 8.1 product key.

This usually makes sense, but Windows 8.1 is not a true Windows version. This is a free upgrade to every Windows 8 user, so there’s absolutely no reason to launch a new product key system.

Microsoft hopes you will be able to install Windows 8 properly and use Windows 8.1 Upgrade Products to get Windows 8.1 in the Windows Store. Only users who purchased Windows 8.1 can install it instead of the original users who purchased Windows 8.

Anyway, this is theory. In fact, we can circumvent this restriction. Windows 8.1 Setup refuses to accept Windows 8 product keys and does not allow us to use it to install Windows 8.1. However, if you type your Windows 8 product key on your desktop after installing Windows 8.1, Windows 8.1 will accept the Windows 8 product key – no, we do not know why it works this way. We could install a new Windows 8.1 if we had a way to skip the product key hints during installation and enter the key later – fortunately, we did have a way to do this. We only need to modify the Windows 8.1 installation media.

Update: We have learned that during the Windows 8.1 installation process, simply entering a KMS Client Installation Key from the Microsoft website will allow you to properly install Windows 8.1. After that, you should be able to change the key from the desktop to the original Windows 8 key.
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Download Windows 8.1 With a Windows 8 Product Key

The second problem is that Microsoft only allows you to download Windows 8.1 installation media using your Windows 8.1 product key. You can not download the Windows 8 product key normally. Fortunately, we can take advantage of another confusing trick to solve Microsoft’s limitations.

First, upgrade Windows only to the product key page. Click the Install Windows 8 button to start downloading the Windows 8 installation media. Run the downloaded tool and enter your product key. After the download starts, close the installation tool.

Next, just visit the product key page to upgrade Windows. Click the Install Windows 8.1 button and run the downloaded tool. The Windows 8.1 installation tool does not prompt you for a key, but downloads Windows 8.1 normally. When finished, select the “Install by Media Creation” option and create a USB installation media or ISO file. We assume that you are creating a USB installation media for this process because this is the easiest way to do this.
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Modify the Windows 8.1 Installation Media

If you try to install Windows 8.1 using the media you created and the Windows 8 product key, you will see an error message. Instead, we need to modify the installation media before starting the installation process.

This is easiest if you have created a USB installation media, as you can edit the files directly on the USB flash drive. If you have created an ISO file, you must modify the files before you burn it to a disc.

Open the USB drive in Windows Explorer or File Explorer and navigate to the source folder. Right-click inside the sources folder, create a new text file and name it ei.cfg. (Make sure it’s named ei.cfg, not ei.cfg.txt – this may be necessary to make sure the file extension is shown.)
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Open the ei.cfg file in Notepad or another text editor. Copy and paste the following text into a text file and save it.
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If you have a Professional Windows product key, replace Core with Professional.
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Install Windows 8.1 Normally and Enter Your Product Key Afterwards

You can now install Windows 8.1 properly using the installation media you created. You will not be prompted for the product key when installing. After the installation process is complete, you will see the product key prompt. You can enter your Windows 8 product key here and for some reason Windows 8.1 will accept it.
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Now only Windows 8 product key new install Windows 8.1 system. The installation media you create can be used to install Windows 8.1 on other systems with Windows 8 product keys so that you can install Windows 8.1 more quickly on multiple computers.

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