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is a version of Windows NT family of operating systems and an upgrade for Windows 8. First unveiled and released as a public beta in June 2013, it was released to manufacturing on August 27, 2013, and reached general availability on October 17, 2013, almost a year after the retail release of its predecessor. However, unlike previous service packs, Windows 8.1 cannot be acquired via Windows Update and only accepts 8.1 specific product keys.
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