WineBottler packages Windows-based programs snugly into OS X app-bundles. No need to install emulators or operating systems - WineBottler uses the great open-source tool Wine to run the binaries on your Mac.
Compatibility tool for Steam Play based on Wine and additional components - GitHub - ValveSoftware/Proton: Compatibility tool for Steam Play based on Wine and additional components
Don't buy a Windows license, don't reboot and don't use a Virtual Machine. Try a free trial of CrossOver to run your Windows software on Mac, Linux and Chrome OS.