Finally Microsoft has released the free update for Windows 8.1 users. The update to bring enhancements in personalization, search, apps, the Windows Store, and cloud connectivity, and has the security and reliability features you expect from Windows. It’s fast and made to work on a variety of devices, especially on the new generation of touch devices.
Windows 8.1 Update can be downloaded from the Microsoft Download Center at the following URL:
Windows 8.1 32-bit (x86): http://www.microsoft.com/en-us/download/details.aspx?id=42327
Windows 8.1 64-bi6 (x64): http://www.microsoft.com/en-us/download/details.aspx?id=42335
Windows Server 2012 R2 Update: http://www.microsoft.com/en-us/download/details.aspx?id=42334