Microsoft is starting to drop PCs from its Windows Insider testing program that are ineligible to upgrade to Windows 11. If you’ve been helping Microsoft test Windows 11 on a machine that doesn’t meet the minimum hardware requirements, you’ll likely see a message in Windows Update warning that you’ll need to reinstall Windows 10.

“Your PC does not meet the minimum hardware requirements for Windows 11,” says Microsoft’s warning. “Your device is not eligible to join the Windows Insider Program on Windows 11. Please install Windows 10 to participate in the Windows Insider Program in the Release Preview Channel.”

Windows 11 testers in both the Dev and Beta channels have started receiving the message on incompatible PCs this week, just as Microsoft has announced its October 5th release date for the upcoming OS. It’s something that Microsoft warned testers would happen at the beginning of the beta period of Windows 11, but it still highlights the often confusing minimum hardware requirements that Microsoft has set.

-The Verge