[Alneyan]

AIC is based on Proportions, and seriously boosts the AI in a variety of ways. The latest version is 4.X if memory serves, and there should be a thread around here. You might have to go on another site to find the actual mod files, though. AIC was probably the mod you used, and I seem to recall something to that effect (I could be confusing you with someone else, though).

I wouldn't really recommend playing Proportions 2.X now: I find Proportions 3.X to be a lot better in multiplayer, and AIC should provide with a more interesting challenge against the AI.