In order to run Visual Liturgy Live on an emulator, you need three things for your Mac:
1. A PC emulator. Examples include:
Parallels
VMWare Fusion
Virtual Box (free)
Once the emulator is installed, you also need to install Windows XP or higher on that emulator. Then install Visual Liturgy Live in the normal way as for any other Windows installation. If possible, use a downloaded install rather than the CD, as this is more up to date.