I just downloaded CS3 from ProDesignTools & installed it onto my new Mac with the original serial number from when I made the purchase. When starting the installation process where you can choose which CS3 programs to install, Illustrator is grayed out with a message to the side saying, "already instsalled." Before downloading the entire CS3 I did try to just download Illustrator since that is the program I am needing more immediately. Obviously my serial number did not work because it corresponds to the entire CS3 Suite & not just Illustrator. I thought I had deleted it (the old Illustrator file) off my computer but I don't know why it still tells me that I've already installed it.
I really need Illustrator and would very much appreciate any help since CS3 is no longer supported by Adobe. THANK YOU!!