Buy Windows 10 Professional Key - 1 PC. This product includes one Windows 10 Professional key for one PC. The key will be sent by email after purchase within minutes. Please check the spam or junk mail folder too. Windows 10 Professional is available for PC in both 32-bit and 64-bit versions, but not for MAC. Windows 10 Home, Windows 7 Home Basic/Premium and Windows 8.1 CoreCountrySpecific/CoreSingleLanguage/Chinese (incl. WMC) CANNOT be directly upgraded to Windows 10 Pro by changing product key in Windows system, but require a clean installation. Download link: Windows 10 Professional https://www.microsoft.com/en-us/software-download/windows10 More information about download and installation you can find in the description below or in the delivery email.