Microsoft actually allows you to install and use Windows 10 without a product key indefinitely.
: You will see a small "Activate Windows" watermark and won't be able to change some personalization settings (like wallpaper).
If you already own Windows but lost your key, you can retrieve it from your computer's BIOS/firmware using a simple command: Open as Administrator.
If you want to remove the watermark legally, avoid "free" sites and look for reputable retailers:
|
|
|
 |
|