I have the iPhoto that came new with my 2009 MacPro. When I try to upgrade at the App Store, I get a message saying "iPhoto 8.1.2 is already installed and was not purchased at the Mac App Store. Do you want to buy iPhoto 9.5"
Does anybody know what I need to do to get a free upgrade?
You must install Mavericks first. Have you done that yet? Once Mavericks is installed then the updates should appear for whatever apps you had installed previously.