Windows 8.1 build 9431


 * This is the client equivalent of Windows Server 2012 R2 Build 6.3.9431.winmain_bluemp.130615-1214

This build was released on 26/6/2013 with the occasion of //BUILD/ 2013 taking place. At first, the ISOs were only avaliable through TechNet & MSDN, while it was possible to download the Store version immediately after //BUILD/ began. The ISOs were made publicly avaliable the day after, on 27/6/2013, when the day 2 keynote started.

Installation
There are two ways to install this preview: through an ISO and through the Store. However, if you have a language different than the ones support or you are running Enterprise on your machine, you are forced to use the ISO version. But if you are on an RT machine, the only way of updating is through the store.

Variants
The ISO version is avaliable in both x86 and x64.

On TechNet you can only download English versions. The MSDN & public release is avaliable in 13 languages: Arabic, English (US), Chinese (Simplified), Chinese (Traditional), French, German, Japanese, Korean, Portuguese (Brazil), Russian, Spanish, Swedish, and Turkish.

An RT version was also released, however the only way to install 8.1 on such a machine is through the store. On 28/06/2013, a zh-cn recovery disk was released on xunlei. It's possible to download the ESD files (basically encrypted WIMs) directly from Windows Update servers, however, the URLs remain unpublic. Some users installed RT without problems, but many others got the infamous "The update is not applicable to your computer" error.



Embedded
On 27/06/2013, Microsoft released Windows Embedded 8.1 Industry Pro Release Preview in its Windows Embedded Pre-Release Programs on Microsoft Connect. It is avaliable in both x86 and x64, and also in many languages.

Embedded
Windows Embedded 8.1 Industry Pro Release Preview June 2013 (may require a Microsoft account) Windows Embedded 8.1 Industry Pro Release Preview June 2013 - direct links Documentation for Windows Embedded 8.1 Industry Preview Release June 2013 Release Notes for Windows Embedded 8.1 Industry Preview June 2013