WINDOWS 8.1 PREVIEW 64BIT/86BIT

Windows 8.1—a free update to Windows 8—is coming later this year, and a prerelease version is available now for you to try. Windows 8.1 has new ways for you to personalize your PC and includes a wave of awesome new apps and services.This Software is mainly for experienced PC users, so if your not sure whether its right for you, read the FAQ.
This Is Officially a Microsoft Product and is taken from Microsoft website.

Product Key: NTTX3-RV7VB-T7X7F-WQYYY-9Y92F

Windows 8.1 x86 (32 bit):

Windows 8.1 x64: