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. …

What happens if I dont have a Windows 10 product key?

Even if you don’t have a product key, you’ll still be able to use an unactivated version of Windows 10, although some features may be limited. Inactivated versions of Windows 10 have a watermark in the bottom right saying, “Activate Windows”. You also can’t personalize any colors, themes, backgrounds, etc.

How long can you use Windows 10 without a license?

Originally Answered: How long can I use windows 10 without activation? You can use Windows 10 for 180 days, then it cuts off your ability to do updates and some other functions depending on if you get Home, Pro, or Enterprise edition. You can technically extend those 180 days further.