I would suggest trying the beta (I think it's still beta) COH launcher built by Homecoming. You'll have to search the forum to find it, but it works AMAZINGLY well on my Mac and it installed super easy! It actually performs better than it did using the other version of Island Rum. And I recently (about 4 weeks ago) installed it on a 2nd Mac in the household, I just don't recall which thread it's in.