OK, G5 IMAC, 2GB ram, 10.5.7 Leopard. Place in SIM3 CD, double click the icon, SIMS installer window appears, double click installer icon, Message (in mac window): You can't open the application "Sims 3 Installer" because it is not supported on this architecture (...sucker!). Yippee. What's the deal on that one? Only freaking Intel processor compatible? BR. The Blob.