How to Downgrade Windows 7 Ultimate to Professional Without Formatting

Update: The latest Windows 11 is here, but if you are still using Windows 7 and want to change the version in the year 2021 or later, keep reading the below steps. Some users mentioned that the modifying registry trick does not work anymore. Hence, I’m including a downgrade tool that may do the job. Anyhow, I’m not able to verify both steps now since Windows 7 is out of support and it is not recommended to use anymore.

Original Post:

I installed/downgraded Windows 7 Ultimate to the Professional version without formatting or reinstalling OS on one of the computers. Even though both are the same Windows 7 family, it is not easy to switch the versions especially backwards. The following method is to fake the Windows OS and trick that we have the Professional version installed, then do an upgrade. The Ultimate version is the higher version of Windows 7 and it can’t be downgraded to lower versions officially without formatting and doing a fresh installation. Anyhow, I found a trick to downgrade Windows 7 ultimate to Professional easily without the new installation.

Steps to Downgrade Windows 7 Ultimate to Professional

We are going to two 2 steps.

  1. Change registry key and tell Windows that we have the Professional version (Take extra precaution while modifying the registry. Better take a backup of the registry before doing any changes).
  2. Insert the actual Windows 7 Professional CD and start the upgrade.

Before starting the installation, do change two keys in Registry. In my case, I had to change the key to ‘ Windows 7 Professional ’. Make sure you are typing the exact OS version which is written on your installation DVD.

Downgrade Windows 7 Ultimate to Professional

After you changed the registry key, insert the Windows 7 Professional CD/DVD and start the upgrade. It is required to enable the option to check the Windows update while doing the installation. So, the process will check the Windows update catalogue online and do the upgrade related to Windows 7 Professional. If the current state of Windows 7 is the latest build and update, then this method may fail because it will not find any updates from the Microsoft catalogue website.

Make sure you have enough space in ‘System Partition’ (usually C drive). Allocate enough time since this will copy your personal data first, downgrade the OS and then copy back your data. If the computer data is so critical, I advise taking a backup of your important data.

I suggest cleaning up (move to a different location) your personal data (such as Desktop, My Documents..etc) before starting the downgrade to save time.

Additional Method

  1. Download Windows 7 Downgrader tool (Google it and find the correct file).
  2. Open the tool with administrative privilege.
  3. Select the OS version you need. You need to have the installation DVD or ISO file of the Windows 7 Professional (or Home)
  4. This tool simply changes the registry keys which we modified manually earlier. Because other steps are identical.
  5. Now insert the DVD or mount the ISO file and start the installation (upgrade) process that is a downgrade in this example.

Windows 7 Downgrade Tool

I hope one of the above methods would be helpful for this downgrade process. It is highly recommended to upgrade your computer to the latest Windows 10 or Windows 11 except you have some genuine and legacy reasons to have outdated Windows OS.

If any of the above solutions did not fix the Windows PC issues, we recommend downloading the below PC repair tool to identify and solve any PC Issues.

Dinesh is the founder of Sysprobs and written more than 400 articles. Enthusiast in Microsoft and cloud technologies with more than 15 years of IT experience.

17 thoughts on “How to Downgrade Windows 7 Ultimate to Professional Without Formatting”

    • Jay,
      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.

    • 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.

      • 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 .. 🙁

    • Hi,
      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.

      • 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

      • 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.

  1. 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

  2. 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

    • Ris,
      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.

      • 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.

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

  4. 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! :\

  5. 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???

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