Win 10 Pro CD-KEY (32/64 Bit) works only for Windows, not for Mac!
Win 10 Home, Win 7 Home Basic/Premium and Win 8.1 CoreCountrySpecific/CoreSingleLanguage/Chinese (incl. WMC) CAN'T be directly upgraded to Win 10 Pro by changing product key in Win system. If You have these editions on you computer, you need to make a clean installation after purchasing Win 10 Pro.
More information about installation you can find is in delivery email.
Please check the spam or junk mail folder too.
This product is valid for activating both 32 and 64 bit versions.
Win 10 Pro key is designed to be compatible with the hardware, software, and peripherals you already own. And if you buy Win 10 Pro key, its always-enabled updates help you stay current on features and security for the supported lifetime of your device.
As long as you buy Win 10 Pro, it gives you absolutely the best experience for doing what you do. Stay focused with easy ways to snap apps in place and optimize your screen space for getting things done. See your open tasks in a single view and create virtual desktops to gain space or group things by project, like Office apps for work and games for play.
Gaming just got even better with Win 10. Not only do your existing games work great, but now you can play and connect with gamers across Xbox One and Win 10 devices. From the best casual games to a new generation of PC gaming, Win 10 is built for games you love.