Some players with Windows 11 operating system encountered an issue with SmartGuard, saying 'Core Isolation' feature is not supported.
The solution is as easy as to switch off this windows feature.
See the below article (It's how to enable, but it also works the other way around):
https://www.windowscentral.com/software-apps/windows-11/how-to-enable-core-isolations-memory-integrity-feature-on-windows-11