If you want to install an app that isn't available in the Microsoft Store, you'll need to switch out of S mode. Switching out of S mode is one-way. Windows 10 in S mode is designed for security and performance, exclusively running apps from the Microsoft Store. After you see a confirmation message on the page, you'll be able to install apps from outside of the Microsoft Store.

On the Switch out of S mode (or similar) page that appears in the Microsoft Store, select the Get button. (If you also see an 'Upgrade your edition of Windows' section, be careful not to click the 'Go to the Store' link that appears there.) 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.

Windows 11 home in s mode