Are there differences between the Direct and App Store versions of Acorn? Yes, there are some small differences. Make sure to check out our larger FAQ for all the gory details. Does Acorn open up layered Photoshop files? Yes! Acorn will open up layered 32bit PSD to the best of its ability. The only app that’s going to be 100% compatible with .psd files is the latest version of Adobe’s Photoshop of course. I’m not running 10.10+, can I still use Acorn? Here’s the lowdown: Acorn 5 requires 10.10+. Acorn 4 requires 10.8+. Both Acorn 2 and 3 require 10.6+. Acorn 1.5.5 runs on 10.4+. If you wish to purchase Acorn 1, 3, or 4 go ahead and buy Acorn 5. Acorn 4.5.6 will accept Acorn 5 registration numbers. But if you need an Acorn 3.x or 1.x registration, email firstname.lastname@example.org and let us know your registration name and number and we will make you a new one that works with an older version of Acorn. Want to know more? Make sure to check out our extensive documentation and FAQ, and we’re of course always ready to answer questions at email@example.com Source.