Download Windows 8.1 Preview ISO File

At BUILD 2013 conference in San Francisco, Microsoft today released the Preview version of “.1” update to Windows 8. All PC users running Windows 8 can now upgrade their installations to Windows 8.1 Preview by installing this update and then following on-screen instructions.
To help Vista and Windows 7 users, Microsoft is offering Windows 8.1 Preview as an ISO file as well so that interested Vista and Windows 7 users can easily test drive Windows 8.1 on their machines by installing Windows 8.1 in dual boot with Vista or Windows 7.

Note that you’ll need to use NTTX3-RV7VB-T7X7F-WQYYY-9Y92F as the product key to install and activate your Windows 8.1 Preview copy.

At this moment, Windows 8.1 ISO files are available to MSDN and TechNet subscribers only.

Link : http://bit.ly/17gnJ22