Can you activate Windows 10 with product key?

To activate Windows 10, you need a digital license or a product key. If you’re ready to activate, select Open Activation in Settings. Click Change product key to enter a Windows 10 product key. If Windows 10 was previously activated on your device, your copy of Windows 10 should be activated automatically.

Can I activate Windows 10 without product key?

Microsoft allows anyone to download Windows 10 for free and install it without a product key. … And you can even pay to upgrade to a licensed copy of Windows 10 after you install it.