There's an interesting subset of Windows machines out there running in "S" mode [1]. This mode restricts the customer to only using applications from the Windows Store.

We get occasional support tickets about the popups that come when trying to run a regular installer while in this mode. Luckily, people can disable "S" mode, but there's no way to re-enable "S" mode without a fresh install.

1: https://support.microsoft.com/en-us/windows/switching-out-of...