Ok so I have aperture and Leopard. So i dont have my cd key anymore so how do I download the update??
is this an old update or when that just came out? I am not on my mac right now, so i can check in an hour when i get back from class. I have never been asked for the cd key when updating before. You might be able to e-mail apple to get your key, I have done this before to get my quicktime pro key, don't know if that works the same for aperture or not, probably depends on if you registered it or not.
Don't fret
When you're opening Aperture, your serial appears in the splash window. Just take a quick screenshot (apple-shift-3) when it appears, and then open the .png that's on your desktop.