Have Multiple Macs but Not All Can Go to Mavericks? Read This!
Aperture upgrade dialog: there’s no going back!
Aperture 3.5 is the latest version of Aperture, and it requires OS X Mavericks (10.9). So what happens if you have an older Mac that can’t go to Mavericks, running Aperture 3.4.5, and want to upgrade Aperture? Put simply… you can’t.
So that could pose a problem where you may want to create a library on one Mac (say your MacBook) and then load it later onto your desktop for finishing. You can go old to new, but you can’t go new to old. So if you’re starting on an older MacBook running Aperture 3.4.5, then copy that Library to your Mavericks/Aperture 3.5 desktop, you’ll be fine. When you open the Library, you’ll see the dialog above, and notice the highlighted bit — “Once upgraded, you will not be able to use this library with previous versions of Aperture”. You won’t be able to move it back to your older system MacBook later.
However if your systems are reversed — the MacBook Pro is the new, Mavericks, Aperture 3.5 system, and your desktop is an older non-Mavericks, Aperture 3.4.5 system — you have a problem. You can not start a project on the portable and move it to the desktop.
So what’s the solution? Quite simply — don’t upgrade Aperture. There are performance improvements, or so we’re led to believe by Phil’s comment in the Special Event (unless of course he was eluding to a future release of Aperture), however there are no references in the Aperture 3.5 upgrade to Mavericks compatibility at all, implying that you don’t have to upgrade. Eventually this may very possibly break, and you’ll no longer be able to run Aperture 3.4.5 on some future version of Mavericks OS X 10.9.x, but for now, you should be good to go.
If anyone notices any issues running Aperture 3.4.5 on Mavericks, let us know in the comments. But for those running older and newer systems, until you’re ready to upgrade your hardware, this is going to be your reality.