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May 01, 2009 12:00 AM

Upgrade of Windows 7 Beta to RC and RTM to require some mucking about

Windows IT Pro
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According to this post on the Engineering Windows 7 blog you won’t be able to perform an upgrade from the Windows 7 Beta to Windows 7 RC (or RTM) without a little bit of fiddling. This is primarily to encourage people to perform upgrades from Vista or fresh installs, which Microsoft wants people to thoroughly test (because that’s what people will be doing in the real world) rather than upgrades pre-release versions of Windows 7 (which only apply to beta and RC users).

If you are running Windows 7 Beta and you try to upgrade to Windows 7 RC straight from the installation media, you’ll get an error telling you that this is not possible. Similarly, if you are trying to upgrade from Windows 7 Beta or RC to Windows 7 RTM, you’ll get a similar message.

The upgrade is possible. You just have to do a bit of mucking around. To perform the upgrade, do the following:

  1. Copy the contents of the ISO or DVD to a separate storage location (such as a bootable USB storage device, a separate partition or whatever)
  2. Open the file \sources\cversion.ini in a text editor and modify the MinClient number to a number lower than the version Windows 7 that you want to upgrade from – so for the beta you would set this to something like 6900.
  3. Save the file and then run the install routine from the location with the modified file

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Comments
  • Howard
    2 years ago
    Mar 15, 2010

    If this works well, then a lot of people will want to do it, including me. But a couple weeks ago I asked a well-known Windows expert if it can be done. He said, Even if you could do it, you wouldnt want to. Too many chances for big-time problems. So Ill be interested in how it goes for Paul and other pioneers in the weeks following this method of upgrade.

    http://www.articlesbase.com/health-articles/acai-optimum-review-does-acai-optimum-work-1956015.html

  • samuel
    3 years ago
    May 09, 2009

    Hi to the first commentor, you are wrong because the build 7100 IS an official RC build, not beta.

    And since you are commenting on 4th May, I suppose that either you are an MSDN subscriber or sort, you have downloaded it through leaked torrents.

    The author here is saying an upgrade from beta such as build 7000, or 7022, 7048, 7057 and so on. I am wondering if such technique can modified as 6519. Since that was the first ever leaked build of Windows 7. (So that users of pre-beta can do a direct upgrade despite who is still using that!)

  • Orin
    3 years ago
    May 06, 2009

    So you managed the upgrade without editing cversion.ini? Odd - I had to do it each time I upgraded from the public beta to the RC - and that's the procedure they outlined in the Engineering Windows 7 blog.

  • Ultan
    3 years ago
    May 04, 2009

    hI oRIN,
    I found this to be incorrect.
    I upgraded my machine from Build 7100 to the RC only by completing step 1 that was outlined from that blog Orin. (Not sure if it being Build 7100 made all the differnce as that was the last beta build prior to the RC)
    I am typing this on that very machine right now (while at 34K feet on a cross counrty flight :))

    The upgrade was competley painless, took all of about 20 - 25 mins from the USB stick.

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