Never have I installed a game software on my Macbook, and before I always had non-macs, so my experience with macs is limited. I haven't installed the game yet, but the trial version wouldn't install after it downloaded. It said the game requires a Mac OSX 10.5.3 at least, and my Tiger version is updated to the fullest. Does this imply that I need the $120.00 Leopard version of Mac now and install that to be able to install the Spore game? I haven't tried it yet, installing the game, because it's being shipped right now, but if this is something to be fixed with a simple patch then I'd rather get it over with now than waste my time when I actually have the game in my hands. I'm also very anxious and want to play it immediately of course. Can you help me?