Upgrading Windows 7 RC1 to RTM Version

Disclaimer: Upgrading from RC1 to Release To Manufacturing (RTM) of Windows 7 is not a supported upgrade so you do this at your own risk! Having said that, the upgrade from Beta 1 to RC1 wasn't supported either and lots of people, myself included, did that just fine.

If you attempt to run the upgrade of Windows 7 RTM on an install of RC1 setup will check a couple of things and then present you with this friendly (not) message: "You can't upgrade this prerelease version of Windows 7. Go online to see how to insall Windows 7 and keep your files and settings."

However, just like the beta 1 to RC1 upgrade, there's a simple fix. If you haven't already, copy the install files to a location you can modify, a directory on your drive works great. Then open that directory and locate the CVERSION.INI file in the SOURCES directory. It's a simple text file, so open it with notepad. The file should look something like this: Change the contents of the file, specifically setting the MinClient value to 7000.0, as shown below: Once this is done rerun setup, and Windows will happily upgrade your RC1 install of Windows 7 to the RTM version.

11 comments:

  1. Hi thanx mate works great I was really pulling my hair out and plus my dad just lost all of his so I really needed to keep myn so thanx again
    Mat

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  2. Hi,
    The windows 7 is looking better OS than its predecessor.By the way,thanks for this wonderful technique to us.

    Cables

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  3. Doug
    I did as you explained and ran the upgrade on my HP notebook yesterday afternoon. Walden, you D man... It went off without a hitch and appears to have done the trick. We'll know for sure in April if it's still working. Still have that annoying little label of eval copy at lower right corner of window. I covered it with the sticky notes gadget. Thankx bro.

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  4. Been a while since I did it, but IIRC the eval label should go away. What does Properties on My Computer say? Sure you're not still running RC1?

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  5. Will this only work if you buy the Ultimate upgrade???

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  6. Hmmm... interesting question. I believe I've done this with both ultimate and pro. Not sure about home.

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  7. It doesn't work with Windows Home Premium - I've just tried it.

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  8. It looks like I can't do an upgrade, so I would assume I need to re-install and start from scratch with everything? THanks.

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  9. The RC was Win7 "Ultimate" so it seems you can only upgrade to the Ultimate final of Windows 7. Makes sense.

    If you can't do an upgrade then yes, you'll have to wipe and reload. Of course you should be able to save your data and settings, but it's a reload of programs.

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  10. Windows 7 is being touted as “everything that Windows Vista should have been – and more!” Despite such labels, though, there are still people who need a little bit of convincing in order to make that move. If you are one of those people, see if these reasons are enough for you.
    Why You Should Upgrade to Windows 7

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  11. nice instructions,i liked it.its a nice informative post.

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