These downloads include pre-release software that may change without notice. The software is provided as is, and you bear the risk of using it. It comes in three formats – 32bit, 64bit and a 64bit with developer tools.
The developer preview with the tools can only be cleanly installed, whereas the 32bit & 64bit can be used for upgrading from Windows XP, Vista and 7. Check the table below for the differences.
Download the binaries here