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You are here: Home / Tech / How to Upgrade the Windows 7 RC to RTM

How to Upgrade the Windows 7 RC to RTM

August 7, 2009 by Paul Spoerry Leave a Comment

The final version of Windows 7 was released yesterday for MS Technet subscribers, but you can’t upgrade directly from a pre-release version—at least, not without a quick and easy workaround, and we’ve got you covered.

The Problem

Windows 7 checks whether or not the current version you are running is a pre-release copy, and prevents you from upgrading further. For reference purposes, this is the error you’ll see when you try and upgrade.

Windows 7 can't upgrade error

The Solution

The solution is to edit a file inside the Windows 7 DVD—which you’ll have to extract to the hard drive to proceed.

  • If you are using an ISO image for the installation progress, you can use the awesome 7-Zip utility to extract the ISO to a folder on the drive.
  • If you are using an actual DVD, you can simply copy all of the files from the DVD to a folder on your hard drive.

Once you’ve extract the files, browse down into the “sources” folder to find the cversion.ini file.

Windows 7 CD files

Once you’ve opened up the cversion.ini file, you’ll notice that the MinClient line has a value of 7233.0, and since the Windows 7 RC release is build 7100, you can understand why it’s not working.

Editing cversion file

All you need to do is change the MinClient value to something less than the current build you are using. For the RC release, you can change it to 7000.

Editing cversion file

Now you can simply launch the setup.exe file from within the folder, and do the upgrade directly from the hard drive. Once you’ve started the setup, click Install now.

Windows 7 upgrade startup

Once you get to the type of installation screen, choose to Upgrade the existing install.

Windows 7 choose upgrade type

Once you reach the Compatibility Report screen (if it doesn’t show up at all, be happy about it), you’ll see the list of applications that probably won’t work once you upgrade. Realistically most of these apps will work just fine, but the important thing is that you’ll be able to upgrade.

Note: You could always smooth the upgrade process by removing any apps that have compatibility problems, before you do the upgrade.

Windows 7 upgrade compatibility report

At this point, the upgrade should start working, and will take a rather long time.

Windows 7 is upgrading just fine

Important Notes

There are a few important things to keep in mind when you are upgrading to the final version:

  • The Windows 7 beta or RC releases were Ultimate edition, so you’ll only be able to upgrade to the RTM (final) if you are installing Ultimate Edition.
  • Whenever possible, you should really backup your files and do a clean install. There are less headaches this way, and you get the benefit of a nice clean profile.

Original article

Filed Under: Tech, Windows, Windows 7 Tagged With: 7, installation, screen, Windows

About Paul Spoerry

I’m a groovy cat who’s into technology, Eastern Thought, and house music. I’m a proud and dedicated father to the coolest little guy on the planet (seriously, I'm NOT biased). I’m fascinated by ninjas, the Internet, and anybody who can balance objects on their nose for long periods of time.

I have a utility belt full of programming languages and a database of all my knowledge on databases... I practice code fu. Oh, I've also done actual Kung Fu, and have a black belt in Tae Kwon Do.

I run. I meditate. I dance. I blog at PaulSpoerry.com, tweet @PaulSpoerry, and I'm here on Google+.

I'm currently work for IBM developing web enabled insurance applications for IBM and support and develop a non-profit called The LittleBigFund.

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