So, I'm installing SC2 for the second time. It finished, and says. "Unable to install - Starcraft 2 cannot be played or installed on PowerPC's." I've already called blizzard and they tried to help, how ever it hasn't worked. My computer is way beyond the system requirements. And yes, I am installing the Mac client.
Then I'm the bringer of unhappy news. The PPC and intel chips have different instruction sets. A lot of mac software is designed to work with either cpu, but SC2 has not been designed this way. It will only work with intel chips. The game is not compatible with your computer. And this isn't something you can fix by replacing the processor. It's either a whole new computer, or no SC2 I'm afraid.