I know that Aperture is officially dead and gone and no longer in the App Store. With that said, I've been pretty heavily using it on my "scanning machine"-a PowerMac G4-I still shoot a decent amount of 35mm and 6x6 transparencies, so depend on my scanners a lot. I like what I'm able to do with 1.5.4, but I'm pretty sure it won't run on my Macbook Pro running Mavericks or even my Mac Pro running Lion(SL on the Mac Pro might be doable). I have a LOT of photos on my MBP, and would like to be able to integrate them with the Aperture library on my G4-plus I also take a lot of photos with a DSLR tethered to my MBP and like to be able to organize/adjust them there. I missed the boat on buying Aperture before they cut it off(I had it on my "to list" but my master's thesis got in the way of doing a lot of that kind of stuff). I know that with some things like older versions of OS X, it's possible to call Apple and "buy" them-you pay and they send you a code to punch into the App store. I just did this with Lion earlier this week. Is there any hope of being able to do this with Aperture, or has Apple cut it off completely?