When most users search this, they want:
Q: Can I upgrade to Windows 10 without a product key? A: Yes, but you'll need to purchase a product key to activate it.
You can technically use Windows 10 forever without ever activating it. Microsoft allows you to download and install the OS for free via the Media Creation Tool. Activated Windows 10 Unactivated Windows 10 Full access to all security/feature updates Most security updates are still provided Personalization Change wallpaper, themes, colors Settings are locked/greyed out Watermark Permanent "Activate Windows" overlay Support Full Microsoft Support access Limited to community forums 5. Finding a "Lost" Key