This is now my third try running the setup. Soon as I download the thing and attempt to execute, it, I dunno, freezes. The explorer window freezes, and if I try opening it from Firefox's download window Firefox itself freezes. The setup never happens. Opening-up Task Manager, I get a Not Responding.
This is weird. I tried chapters 1+2, and they were fine, as was W&G Episode One and Strong Bad Episode Five.
I'm using Windows XP. I know you probably don't need them, but here are my specs:
Processor: 410 @ 1.46 GHz, ~ 1.5GHz
Memory: 1406 RAM
Graphics card: GeForce FX 5200
1 Gb of RAM.