This product includes one Windows 10 Home key for 1 PC. Windows 10 Home is available for PC in both 32-bit and 64-bit versions, but not for MAC. Windows 7 Professional/Ultimate and Windows 8.1 Professional (incl. WMC) CANNOT be directly upgraded to Windows 10 Home by changing the product key in the Windows system. You can buy this Windows 10 Home edition and perform a clean installation, or purchase our Windows 10 Professional for a direct upgrade. Business hours: 10:00 AM - 5:00 PM WIB We apologize and kindly ask for your understanding if order responses are delayed, as the admin is human, not a robot. If you are served outside these hours, it means the admin is currently ON.