Q: I have lost my original disk and serial number

Do you need to reinstall or only need the serial number?

To retrieve the serial number - if Aperture is still running on any Mac you own, you can see the serial number in the "About" panel when Aperture is running:

From the main menu bar:  Aperture > About Aperture.

If you do no longer have a running Aperture installation to retrieve the serial number, contact Apple with a proof of purchase and ask for a replacement serial number, see these links as to what is considered to be a proof of purchase:

Pro Application Replacement Serial Numbers: http://support.apple.com/kb/HT1861

If you need an installer to reinstall Aperture without CD/DVD, download the Aperture Trial:

You can download the Aperture Trial here:

     Aperture 3.1 Trial

Delete your current Aperture version from the Applications folder, then run the Trial installer and immediately update using "Software Update" from the -menu.

Then launch Aperture and enter your serial numbers, all while signed in as an administrator.

Regards

Léonie