Windows 8 Pre-Release download active now! You can download Windows Developer Preview 32-bit and 64-bit. No activation is required. 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.