Hi Frank, thanks for reaching out. My name is Bernard a Windows fan like you. I'll be happy to help you out today.
I understand the issue you have, there is nothing to worry I am here to help, Windows 11 S mode, will only allow installation from the Microsoft Store and is unable to install outside or any downloaded installer, you need to switch out of S mode first, before you can install any drivers, software and apps outside Microsoft Store, if you are okay switching to S mode you may follow the steps from the link below:
https://support.microsoft.com/en-us/windows/swi...
Note: S mode is designed to secure the PC from installing any outside apps that may harm the device, Switching out of S mode is only one way and you cannot go back to S mode.
Let me know how it goes and I hope that helps.
Bernard