I bought a Sony reader for my wife. I have a Mac and know the Sony software is not compatible with my machine. I was told though, that I can still download books on my machine and transfer them to a card. Can this be done with Digital Editions? I can not figure this out.
You need to authorize your Sony Reader with your AdobeID. Unfortunately that can only be done on a Windows computer (that you have a copy of Digital Editions authorized to your Adobe ID).
Also you will not be able to read any "loaned" content by just transfering the file to the device. Loans require necessary additional information that can only be transferred on a Windows computer.