Upgrade From Windows 7 RC to Windows 7 RTM

by Abhishek Bhatnagar on February 18, 2010

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Trouble:

Windows 7 RC version is going to expire soon. On 1 March 2010, it will start a bi-hourly shutdown and will finally expire on 1 June 2010.

windows-7-logo

If you have already got Windows 7 RTM and trying to upgrade to that version, the Windows Setup does not allow to upgrade from Windows RC version to Windows RTM version. It gives an error saying

You can’t upgrade this prerelease version of Windows 7. Go online to see how to Install Windows 7 and keep your files and settings

In this article we will share a trick using which you can upgrade from RC to RTM version of Windows 7.

Fix:

Before I tell you the fix, lets talk of the reason for this issue. There is a file in the Windows 7 Install DVD which checks for the installed version on Windows 7, if it finds the version lower than a particular version number, it will deny the upgrade. This has been designed this way to prevent the direct upgrade from Windows RC to RTM version. This version number is written in a file called cversion.ini on Windows 7 Installer DVD.

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To fix the issue, you can copy all files from the DVD to a folder on your hard disk. Inside the folder named “sources” you will find a file named “cversion.ini” . Open this file with notepad.

 

It will have 3 lines something like seen below:

[HostBuild]

MinClinent=7233.0

MinServer=7100.0

 

You need to modify the second line in this file and make the number as 7000 like:

[HostBuild]

MinClinent=7000.0

MinServer=7100.0

 

Save this file and run the setup.exe file. The modifications done in the file above will trick the windows setup into believing that you are upgrading from a non RC version. This will upgrade your Windows 7 RC to Windows 7 RTM version.

In case you are using Windows 7 ISO instead of Windows 7 DVD, you can use 7-zip freeware tool to extract the contents of ISO file on your hard disk.

[ Thanks To – How To Geek ]

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