Do we have to pay to activate Windows 10?
It’s actually free to install Windows 10 without a license key. That’s the bit of Microsoft’s OS that you actually need to buy as the OS itself has a longer grace period. However, functionality is limited without a genuine key.
What happens if u don’t activate Windows?
If you don’t activate Windows 10, some features will be disabled upon the expiry of the trial period. For instance, you won’t be able to customize your PC or laptop, meaning features like themes, lock screen, colors, fonts, and taskbar will return to their default settings (if you customized them).