In our Store, you can purchase an original Windows 10 license key that will activate your PC. We promised the key is 100% valid. The Home version of Windows 10 costs $39.99, while the Pro version of Windows 10 costs $49.99. The product key will be in the confirmation email you received after buying it. It’s a 25-character code, and it will immediately activate your current copy of Windows 10 installation.