Windows 10 Professional CD-KEY (32/64 Bit) works only for Windows, 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 Professional by changing product key in Windows system. If You have these editions on you computer, you need to make a clean installation after purchasing Windows 10 Professional.
More information about installation you can find in delivery email.
Please check the spam or junk mail folder too.
Windows 10 Pro is designed to be compatible with your existing hardware, software, and devices. While always on, updates help you stay up to date with security features and support for the lifecycle of your device.
If you buy a Windows 10 Pro license, it will give you absolutely the best experience to do what you do. Stay focused with simple ways to set up apps and optimize your screen space to get things done. View your open tasks in one view and create virtual desktops to save space or group items by project, like Office apps for work and games for playing.
Games are even better as long as you buy the Windows 10 Pro product key. Not only do your existing games work great, but you can now play and connect with players on Xbox One and Windows 10 devices. From the best casual games to a new generation of PC games, Windows 10 Pro is built for gaming that you like.
Some users may fear unusual operation on Windows 10 Pro, but the fact is that it is a really easy and convenient experience with it. You will find that it is quick to know and that you cannot do without it after a long use. No need to say, start a comfortable system now!