In the Switch to Windows 11 Pro section, select Go to the Store. On your PC running Windows 11 in S mode, open Settings > System > Activation. If you make the switch, you won't be able to go back to Windows 10 or Windows 11 in S mode. There's no charge to switch out of S mode. Therefore, if you have the Pro, Enterprise or Education editions of Windows 10 in S mode, you'll need to switch out of S mode to upgrade to Windows 11. If you have the Pro, Enterprise, or Education editions of Windows 10 in S mode, Windows Update will not offer Windows 11 because S mode is not available in those editions of Windows 11. Windows 11 in S mode is only available in the Windows 11 Home edition. If you want to install an app that isn't available in the Microsoft Store, you'll need to switch out of S mode. Windows 11 in S mode is designed for security and performance, exclusively running apps from the Microsoft Store.