Summarize this article in one sentence.
If your computer defaults to booting up in the Mac OS, hold down the "Option" key upon startup, then select "Windows" from the options provided.  After the PC games have been downloaded, you can play them from your Mac while logged into the Windows OS.

Summary:
Log in to the Windows OS on your Mac. Use your Windows Internet browser to navigate to the website from which you want to download PC games. Download the PC games to your Mac.