The Windows 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.

Windows Developer Preview English, 32-bit (x86)
Size: 2.8 GB
SHA-1: 4E0698BBABE01ED27582C9FC16AD21C4422913CC

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Windows Developer Preview English, 64-bit (x64)
Size: 3.6 GB
SHA-1: 79DBF235FD49F5C1C8F8C04E24BDE6E1D04DA1E9

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Windows Developer Preview with developer tools English, 64-bit (x64)
Size: 4.8 GB
SHA-1: 6FE9352FB59F6D0789AF35D1001BD4E4E81E42AF

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