So I had to completely remove Aperture from my machine as the last update killed it. 3.4.3 going to 3.4.4 by the way. I didn't buy Aperture from the App Store so am using the original disk. v3.1 Now trying to reinstall - I open the Aperture mpkg installer - and can't progress past "This package will run a program to determine if the software can be installed" http://imgur.com/aqOu4Km Hitting continue or cancel does nothing. This has happened in the past, but the resolve was a complete OS reinstall - which I don't want to have to resort to. I have tried finding appropriate preference and/or cache files under library, etc - but don't want to delete anything without knowing for sure. Any tips? Thank you.