this prerelease version of windows 7 has expired
How to Direct In-Place Upgrade Windows 7 Beta or RC (Prerelease Version) 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
Hack to Upgrade Windows 7 From Beta or Pre-RC to RC (70xx to 71xx) Version Directly
According to Microsoft, it is not possible to directly or in-place upgrade from Windows 7 Beta or pre-RC build versions such as build 7077 (32-bit Windows 7 Build 7077 or 64-bit Windows 7 Build 7077) to final RC (Release Candidate) build, which widely rumored to be build 7100. The blocking of direct upgrade from beta or pre-RC builds to official RC build is meant to avoid potential issues that may affect such upgrade path.
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