![]() If you are exercising downgrade rights from Windows 10 Pro OEM, this key can be either a retail upgrade, full version, OEM preinstalled, or System Builder product key. A product key from a computer that is running Windows 7 Professional or Windows 8.1 Pro.If your system came preinstalled with Windows 10 Pro, you’d need to download or borrow a Windows 7 Professional or Windows 8.1 Pro disc. If you don’t have a license, you will have to purchase a Windows 7 or Windows 8.1 license. The copy of Windows 7 or Windows 8.1 you want to downgrade.You Can Revert a Windows 10 Upgrade to Windows 7/8.1 but Don’t Delete Windows.oldĭowngrading is an involved process I strongly recommend you have everything in place before you start this project, such as:.Rollback Windows 10 Upgrade to Windows 7 or 8.1.For more on rolling back, check out one of the following articles: When you upgrade Windows 7 or 8.1 to Windows 10, you have a 30-day window where you can roll it back to the previous version and not lose any of your data. Important Note: This is a different process than rolling your Windows 10 upgrade back to the previous version.
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