I'm setting up a projection map for a non-profit that will have images projected onto angular and unusually shaped walls. I use modul8 on my mac in the past, but this case is different. They use PC (in fact their whole show runs off of a laptop) and they want the ability to change the images based on the theme of the show. They have an A/V guy, but I don't want to suggest complex software that is going to be hard for a beginner to use. What software should I recommend and then use to set up their show so they don't have to keep calling little old expensive me?
EDIT: I should also mention that this is a small non-profit, so free or really cheap would benefit them greatly.