Currently Being ModeratedFeb 20, 2013 7:39 AM (in response to karlake)
After reinstalling Aperture on a new Mac you need to enter all serial numbers, beginning with the first version you bought, then the upgrade serial numbers. If you no longer have the Aperture 1 and 2 serial numbers, contact Apple for a replacement serial number.
See this support article: Pro Application Replacement Serial Numbers
If you want to buy Aperture again, but cannot, because it is already installed, deinstall it, then try to buy from the AppStore, but with a proof of purchase Apple should provide you with a replacement serial number.
Currently Being ModeratedFeb 20, 2013 8:00 AM (in response to léonie)
OK, I understand. I have no proof of my first purchase left. It isnt so much money to purchase it again. Just let´s hope that it find my Aperture Library and iPhoto Library after a new install. I shall try it later today :-)
Thank you for your advice!
Currently Being ModeratedFeb 20, 2013 8:18 AM (in response to karlake)
When you install the new version it should find you libraries. If it doesn;t you can locate the libraries in the Finder and then double click it. This will make Aperture open the library and set it as your default library.