Maybe I didn't explain..I started with Aperture 1 and then "upgraded" Aperture 2 and then 3. All of these were on the same computer and with the use of hard discs I purchased through Apple.
I now have a new computer and the update 2 & 3 discs with paperwork but Aperture 1 is long gone....I tried to load from the Aperture 2 disc but it asked for the original disc...no habbu..
I'm surprised by this. As long as you have the serial numbers for each version you should be able to just put in the Aperture 3 disk and install from that, the older code isn't needed just the serial numbers.
You could also try what EVO67 wrote load the Aperture 3 trial. You can turn that into a full version if you have the serial numbers.