Hack to Upgrade Windows 7 From Beta or RC to RTM

cversion.ini

According to Microsoft, it is not possible to directly or in-place upgrade from Windows 7 Beta or RC build versions.  A few tweaks and enhancements have been introduced during the development process, which can enhance support of Windows Vista to Windows 7 build-to-build upgrade.

Download the Windows 7 ISO.

  1. Burn the Windows 7 ISO image to a DVD, and then copy and whole image to a storage location that you wish to run the upgrade from (can be either any directory/folder on any partition/drive on the machine running the pre-release build, or a bootable USB/FireWire flash drive).Alternatively, it’s possible to directly extract the content of the ISO to a desired folder using file extraction tool such as WinRAR.
  2. Browse to the sources directory.
  3. Open the file cversion.ini in a text editor such as Notepad.
  4. Modify the MinClient build number to a value lower than the down-level build. For example, change 7xxx to 7100.
  5. Save the file in original place and original name.
  6. Start the setup process of Windows 7 as per normal from the modified copy of the installation files, and the version check will be bypassed.

Author: Jas Dhaliwal

Jas Dhaliwal is a highly experienced International Social Media Strategist. He specializes in building and engaging with social communities across the web. Born and bred in London, he is passionate about technology and social anthropology. You can follow @Jas on Twitter