Software overview:
Windows 8.1 (codenamed "Blue"), the first major update to Windows 8 and RT, was officially announced by Microsoft on May 14, 2013.Following a presentation devoted to the update at Build Conference 2013, a public beta version of the update was released on June 26, 2013.
Windows 8.1 was released to OEM hardware partners on August 27, 2013, and released publicly as a free download through Windows Store on October 17, 2013.Volume license customers and subscribers to MSDN Plus and TechNet Plus were initially unable to obtain the RTM version upon its release; a spokesperson stated that the change in policy was to allow Microsoft to work with OEMs "to ensure a quality experience at general availability."However, after criticism, Microsoft reversed its decision and released the RTM build on MSDN and TechNet on September 9, 2013.
Unlike previous Windows service packs, Windows 8.1 can only be obtained as a free update through Windows Store by users of retail or OEM versions of Windows 8, Windows 8 Pro, or Windows RT, and it must be downloaded individually on every PC. Users of Windows 8 Enterprise, volume license users, and those who obtained Windows 8 through MSDN cannot download 8.1 through Windows Store; they must obtain new, Windows 8.1-specific installation media and install or deploy 8.1 through the traditional Windows installation process, as either an in-place upgrade or clean install. While ISO images can be obtained through various means, they do not accept Windows 8 product keys (however, the resulting installation can still be activated with a Windows 8 product key
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