Do you need Windows 10 for your PC?

Still, technically you don’t need a Windows 10 key to use your rig. … The other option that’s also free is 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.

How do I know if I need Windows 10?

To see which version of Windows 10 is installed on your PC: Select the Start button and then select Settings . In Settings, select System > About.