Windows 8 Developer Preview downloads

The Windows 8 Developer Preview is a pre-beta version of Windows 8 for developers. These downloads include prerelease software that may change without notice. The software is provided as is, and you bear the risk of using it. It may not be stable, operate correctly or work the way the final version of the software will. It should not be used in a production environment. The features and functionality in the prerelease software may not appear in the final version. Some product features and functionality may require advanced or additional hardware, or installation of other software.
Note: You can't uninstall the Windows 8 Developer Preview. To go back to your previous operating system, you must reinstall it from restore or installation media.

Windows 8 Developer Preview with developer tools English, 64-bit (x64)

DOWNLOAD (4.8 GB)
Sha 1 hash - 6FE9352FB59F6D0789AF35D1001BD4E4E81E42AF
All of the following come on a disk image file (.iso). See below for installation instructions.

• 64-bit Windows 8 Developer Preview
• Windows SDK for Metro style apps
• Microsoft Visual Studio 11 Express for Windows 8 Developer Preview
• Microsoft Expression Blend 5 Developer Preview
• 28 Metro style apps including the BUILD Conference app

Windows 8 Developer Preview English, 64-bit (x64)

DOWNLOAD (3.6 GB)
Sha 1 hash – 79DBF235FD49F5C1C8F8C04E24BDE6E1D04DA1E9
Includes a disk image file (.iso) to install the Windows 8 Developer Preview and Metro style apps on a 64-bit PC.
Note: This download does not include developer tools. You must download the Windows 8 Developer Preview with developer tools 64-bit (x64) to build Metro style apps.

Windows 8 Developer Preview English, 32-bit (x86)

DOWNLOAD (2.8 GB)
Sha 1 hash - 4E0698BBABE01ED27582C9FC16AD21C4422913CC
Includes a disk image file (.iso) to install the Windows 8 Developer Preview and Metro style apps on a 32-bit PC.
Note: This download does not include developer tools. You must download the Windows 8 Developer Preview with developer tools 64-bit (x64) to build Metro style apps.

Live SDK

The Live SDK provides a set of controls and APIs that enable applications to integrate Single Sign On (SSO) with Windows Live ID and access information from SkyDrive, Hotmail and Windows Live Messenger. To learn more, sign up for our technical preview.

System Requirements

The Windows 8 Developer Preview works great on the same hardware that powers Windows Vista and Windows 7:

• 1 gigahertz (GHz) or faster 32-bit (x86) or 64-bit (x64) processor
• 1 gigabyte (GB) RAM (32-bit) or 2 GB RAM (64-bit)
• 16 GB available hard disk space (32-bit) or 20 GB (64-bit)
• DirectX 9 graphics device with WDDM 1.0 or higher driver
• Taking advantage of touch input requires a screen that supports multi-touch
• To run Metro style Apps, you need a screen resolution of 1024 X 768 or greater

Notes about installing the Windows 8 Developer Preview

A clean install is supported on all builds, but you can upgrade if you are installing a download without the developer tools. You will receive the full set of migration options when setup is launched in Windows. To dual-boot, you must first boot from media and choose an alternative partition.

Install on:	Windows 8 Developer Preview with developer tools	Windows 8 Developer Preview without developer tools (32-bit or 64-bit)
Windows 7 and Windows Vista	Clean install only	You can keep accounts, files, and settings
Windows XP	Clean install only	You can only keep accounts and files

How to install the Windows 8 Developer Preview from an ISO image

The Windows 8 Developer Preview is delivered as an .iso image that must be converted into installation media stored on a DVD or a USB flash drive. On Windows 7, the easiest way to convert this file is to use Windows Disc Image Burner. On Windows XP and Windows Vista, a third-party program is required to convert an .iso file into installable media—and DVD burning software often includes this capability.
Note: The .iso file that contains the developer tools requires a large capacity DVD called a DVD-9, as well as a DVD burner that can handle dual-layer (DL) DVDs. Most modern burners should be able to handle this format.
Are you an MSDN Subscriber?
Go to the MSDN subscriber page to see additional developer preview downloads available.