So, about two and a half months ago, I got my first Mac from my aunt. (iMac G5, running OS X 10.4.11) She is a graphic designer, so when I got it, it already had the Adobe CS4 programs on it. I am now thinking about upgrading to 10.5(Leopard), but I'm scared I'll lose those applications since I don't have the installation disks for them, how do I upgrade without losing them?