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HEREIf you bought a Windows 10 PC with S mode installed, you may have been surprised by what you couldn't do. Don't be dismayed--you aren't stuck with S mode. In fact, you can switch out of S mode at any time.
To switch from S mode to the full version of Windows 10 hiding behind it, navigate to Settings | Update And Security | Activation. In the Activation menu, look for Switch To Windows 10 Pro (or Home--you'll see one of the two depending on what version of Windows 10 your computer has).
Clicking Switch will open the Microsoft Store and prompt you to "Get" the full version, akin to installing an app. Once you do that, your PC will switch over to its full version of Windows 10 and you'll be free to install whatever apps you wish.
Be forewarned: Switching out of S mode is a one-way street. Once you turn S mode off, you can't go back, which could be bad news for someone with a low-end PC that doesn't run a full version of Windows 10 very well.