Download Processing 3, and open procjam2.pde in Processing 3. Then press Run (play button in the upper-left). I'll also try to create a stand-alone version of it so that people don't have to go through this process and stuff... it's a little complicated, since it involves the saving and loading of a file, and I think the paths work differently when it's a stand-alone application or something... it's weird. I'll try though! And sorry for taking so long to reply...