How Do I Downgrade from Windows 7 Ultimate to Professional Without Cd?

5 Answers. You cannot downgrade to Windows 7 Pro without doing a complete re-installation, and you cannot use a Windows 7 Pro activation key to activate Windows 7 Ultimate. However, you should be able to use the activation key from an OEM copy of Windows Ultimate that you purchase.

How do I downgrade from Windows 7 Ultimate to Windows 7 Professional?

Save the file to your hard disk and extract it.

1. Double click the Windows 7 Downgrader executable (notice I currently have Windows 7 Professional installed)
2. As you can see, the Windows 7 Downgrader utility is quite simple. …
3. Click Install Now.
4. Click Upgrade.
5. What you are doing now is a repair upgrade.

How do I downgrade my Windows 7?

In the Settings app, find and select Update & security. Select Recovery. Select Go back to Windows 7 or Go back to Windows 8.1. Select Get started button, and it will revert your computer to an older version.