Windows 8.1 It's practically one UPDATE for Windows 8 operating systems, so that all users Windows 8 can do Upgrade to Windows 8.1 free, through Windows Store. Users of other versions of Windows (Windows XP, Windows Vista and Windows 7) will have to purchase a Windows 8.1 license to be able to install and use this system.
Many users Windows 8 believed that, given that Windows 8.1 is an update for this operating system, Windows 8 License Codes It should have worked for Windows 8.1. And while this would have been justified, unfortunately, when using a Windows 8 license code at a Installation Clean A Windows 8.1 (Installation with the help ISO files), is displayed Error message who cares the users as the respective license code is incorrect or invalid.

Although the exact reason is unknown, it seems that Microsoft did this intentionally, to force Windows 8 users to do the free upgrade through Windows Store (which is why he did not make available Windows 8.1 installation ISO images than for users who buy a Windows 8.1 license).
However, there is a method by which Users can use a Windows 8 license code to install and activate Windows 8.1, which, although not supported by Microsoft, is still approved. The method consists of using a Generic Windows 8.1 license code for system installation, after which users can use Windows 8 license code to activate the product.
Windows 8.1 generic license codes can be obtained from the next Microsoft's official page:
KMS Client Setup Keys for Windows.
Note: To activate the Windows 8.1 system with the Windows 8 license code, users must use the Change Key Link in System Properties.
STEALTH SETTINGS – How to clean install Windows 8.1 with a Windows 8 product key
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