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May 20, 2014 12:28 PM in response to skybluewhiteby léonie,★HelpfulThis document describes, how replacement serial numbers can be obtained, but you would need your receipt:
Pro Application Replacement Serial Numbers
It might be easier to restore your system to the state before the update from a full backup (Time Machine Backup, bootable clone) and to write down the serial number from the "Aperture > About Aperture" panel. Then try to update again.
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May 20, 2014 12:32 PM in response to léonieby skybluewhite,Thanks! I am trying to find the reciept. Hopefully I can recover the serial number from backup. I did not think about that.