Windows 10 S is designed for security and performance, exclusively running apps from the Microsoft Store. Customers with Windows 10 S who need the features of Windows 10 Pro can switch to Pro through the Microsoft Store.
A fee may apply when switching from Windows 10 S to Pro. If so, payment is collected through the Microsoft Store.
Switching to Pro is one-way. If you make the switch, you won't be able to go back to Windows 10 S.
To learn more or switch to Pro, select the Start button, then select Settings > Update & security > Activation. Under Upgrade your edition of Windows, select Go to Store.