[Guide] How to Downgrade Windows 7 Ultimate to Professional

Downgrade Windows 7 Ultimate to Professional

Recently I had to install/downgrade one of my friend’s  Windows 7 Ultimate to Professional without format or data lose. I was thinking it could be straight forward and easy since both are same Operating Systems. But, that was not the scene. Ultimate version is the higher version in Windows 7 and it can’t be downgraded to  lower versions officially without formatting or doing a fresh installation. Anyhow, I found a trick to downgrade Windows 7 ultimate to Professional easily without new installation.

I’m not the owner of this trick, but I can confirm this works well.

Before start the installation, just change the two keys in Registry. Its like you are faking the Windows 7 installation that you are using the same version which you are going to install. In my case, I had to change the key to ‘ Windows 7 Professional ’. Make sure you are typing the exact and correct OS version which is written on your installation DVD.

Downgrade Windows 7 Ultimate to Professional


After you change the registry key, insert the Windows 7 Professional installation medium and start.

Make sure you have enough of space in ‘System Partition’ (usually C drive). Allocate enough of time since this will copy your personal data first, downgrade the OS and then copy back your data.

I suggest to clean up (move to different location) your personal data (such as Desktop, My Documents..etc) before start the downgrade for saving time.

Because of this method worked great for me and I managed to downgrade Windows 7 Ultimate to Professional, I recommend the original source with more details and screen shots.

Check and let me know if you face any difficulties.


  1. Jay says

    Hi, I have 7 Ultimate too.

    Question, why would one chose to downgrade from Ultimate to Pro?

    • says

      That’s a good question.
      This is for the people who installed cracked and beta/demo higher versions and now want to install licensed copy of lessor versions.

    • Matthew says

      MS will be dropping support for ultimate years before pro so thats one good reason. Also ultimate does not offer anything extra to me that I would want so pro works fine for me.

      • Muhammad Fahad says

        i downgraded to pro because i have HP probook 4530 s, although all drivers works fine with ultimate but wifi and bluetooth drivers are not compatible , also not provided from manufacturer .. :-(

    • Aaron says

      mi name is Aaron, in my case, i have Windows 7 Ultimate, (hack version), but now I want Install Windows 7 Professional because I have a key product original, that is the reason for a downgrade.

      • Ryan says

        Hey ,
        try using windows anytimE UPGRADE & type the product key of w7 pro, its done.I’ve used this before let’s see its working for you or not

      • Grace says

        Hi, I have window 7 ultimate Hack version too. I try to change the registration ID to downgrade to window 7 professional version. But I can’t find the folder or right path. Is there any one can help me? Thanks.

  2. says

    If somewone likes the olderthings than the newer Win7. The two are for better network applications that and a whold crapload of cash. I completly love my setup now I’ll show you in a sec.

    1. Never ever use a Motherboard that does and has more on it than you need to use. I good see very good price on a (CPU) and Make sure that you use an AMD chip. Because they are listed at halfprice

  3. Ris says

    hey i tried ur method of changing the registry from ultimate to professional but when i run update it comes up a message saying the current windows is a newer version than the one u trying to update. how can i fix this

    • says

      I suspect the registry value is not update properly, or some spelling mistakes. Please check again. Restart the PC after registry change and try again.

      • Ris says

        i have double check and there is no spell mistake. here is the exact message error which came up “Your current version of Windows is more recent than the version you are trying to upgrade to. Windows cannot complete the upgrade”. also how can i update registry value.

  4. Ant says

    Thanks for this, I have just used it to downgrade an expired hacked Ultimate version to a licensed Pro version.

  5. Gaurav says

    Hey, I’d a problem doing this… It still shows the compatibility error even when I’ve changed the registry values…! What to do now… Please Help! :\

  6. teiz says

    i got windows 7 ultimate (hacked) so evry tym i turn on my system it says me to get a genuine version of windows. bt nw m tryin to dwngrade it to basic cz dats wot i had earlier n evn my original product key isn’t workin. so wot sud i do nw???