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Downgrading Windows 7 Ultimate RC to Premium or Professional                  Print Preview Print Preview

Many users are running Windows 7 Ultimate RC and would like to throw caution to the wind and simply install Home Premium or Professional right over their current install.

1. Changing two registry keys in Windows 7 Ultimate RC:

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2. Make sure to spell the editions correctly: HOMEPREMIUM, Windows 7 HOMEPREMIUM  ( or Professional, Windows 7 Professional )

Note: Different Languages/DVD’s  are spelled differently, look on the DVD that you have for the correct spelling you can see a list like this by putting the DVD in and starting the install without entering a key. To stop the install at this point click the red X.

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3. Extract all the files from the DVD and change the cversion.ini file to 7100 in the sources folder, so RC can be upgraded to RTM:

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4. Now start the downgrade from the extracted files ( double click setup.exe ).

November 4, 2009 · Filed Under FrontPage, Windows Seven

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Sp00kyNo Gravatar
February 26th, 2010 at 2:23 pm

Thank you, I had RC 64 bit version and wanted to upgrade to ultimate 64 and it was a no no. Now it’s possible thank’s to you.
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  • Comments:
    • Eric: Thanks a lot :)...
    • Sp00ky: Thank you, I had RC 64 bit version and wanted to upgrade to ultimate 64 and it was a no no. Now it's possible thank's to you....
    • vtwintom: Cool - whoever you are. I've been up working for close to 50 hours so far and one of the guys who will run the presentation with the N° 3 Yacht builder worldwide in Bremen, sent me a .ppt after midnight to get it up and running in 3 different movies ...
    • DamnMachine: If you want to disable the thumbnail previews try number 2 from here: http://damnmachine.com/309/windows-7-taskbar-reg-tweaks.html...
    • mkisaacs: This is the only way I have determined to accomplish this. To disable thumbnails preview compeltely, set this value in the registry to 0. It will only display a thumbnail when there is one window in this case, which seems somewhat more acceptable....
    • DamnMachine: I need more infomation about where you got stuck or what that picture is suppose to be about....
    • andreasas: how make image bot.wim??http://lookpic.com/i/368/XviSCXL.jpeg...
    • sayWHAT: thanks... i love my internet :-)...
    • steve smith: thanks for the calibri font...
    • Sean: Thanks for the font guys!...
    • Julie: thank you! :)...
    • Sherzod: Thanks for this font....
    • amy: thanks dude !...
    • Joakim: Dear author - I salute you! I finally did yet another search for disabling the thumbnail preview, this time changing my keywords slightly, and found your blogpost on Google. Ever since I purchased Windows 7 Professional (x64, build 7600) to repla...
    • nieyda: really thanks.... good job (^^,)...