Wenn das Update (http://support.apple.com/kb/DL1006) auf Aperture 3.0.1 mit der 30-Tage-Trial nicht will, hilft es, die Datei 

 
/Library/Preferences/com.apple.AECT.plist

zu löschen. Die Release Notes gibt's hier: http://support.apple.com/kb/TS2518


If the update (http://support.apple.com/kb/DL1006) for Aperture 3.0.1 with the 30 day trial doesn't work, try deleting 

 
/Library/Preferences/com.apple.AECT.plist

which shall fix the problem. Click the link for the release notes: http://support.apple.com/kb/TS2518