How to Direct In-Place Upgrade Windows 7 Beta or RC to Windows 7 RTM
Officially Windows 7 does not allow upgrade path from prerelease version of Windows 7 such as Windows 7 Beta or Windows 7 RC (Release Candidate) to Windows 7 RTM, which has the build version 7600.16385. When user attempts to directly in-place upgrade Windows 7 RC or Beta or any pre-release version from within Windows 7 desktop itself to final Windows 7 RTM gold release, the setup will load, but stop at Compatibility Report, which shows the following error