Here's the info you requested!
Microsoft recommends users to do a clean install rather than upgrading from Windows 7 Beta (or any other builds) to Windows 7 RC build. It is not possible to upgrade your Windows 7 Beta to RC
unless you bypass the check for the pre-release upgrade. Even though this is not recommended by Microsoft, below are the steps to bypass this check (from the E7 blog):
- Download the ISO as you did previously and burn the ISO to a DVD
- Copy the whole image to a storage location you wish to run the upgrade from (a bootable flash drive or a directory on any partition on the machine running the pre-release build)
- Browse to the sources directory
- Open the file cversion.ini in a text editor like Notepad
- Modify the MinClient build number to a value lower than the down-level build. For example, change 7100 to 7000
- Save the file in place with the same name
- Run setup like you would normally from this modified copy of the image and the version check will be bypassed
(atleast this confirms the new
7100 milestone)
So, make sure you backup your machine or use
Windows Easy Transfer to move your accounts, settings, files etc., and then install Windows 7 RC.