I recently installed the Zeus Combat Skills & AI Spotting modular. The mod installed correctly and was activated in expansions normally then it began improving the AI's intellect as described.
I then launched a custom scenario I downloaded through Armaholic and began playing, I was killed during the mission and attempted to reload the last save. Then I got an in game error message saying that I couldn't reload the save because to do so was dependent on the Extended eventhandlers mod that wasn't present. So I installed the mod and then tried to reload a save and was unsuccessful. I researched the error message I got and I ended up installing the Community Base Addons mod.
Now when I launch ArmA 2 OA I get the error message: "Addon 'Extended_EventHandlers' requires addon 'CAWeapons3'".
I have a feeling the solution is simple and I'm just not seeing it.
P.S. I have the Steam version, and I'm running about 20-30 unit, vehicle, island, and scenario mods, nothing heavy duty.