Mac OS 10.4, Adobe Digital and eReadders

This question may have been discussed before, but I can't seem to find the answers I need.

Which version(s) of ADE will run on Mac OS 10.4?

Will any versions of ADE "see" a Sony eReader in OS 10.4?

Will any Sony Reader App Setup (the one in the Settings folder) install on OS 10.4?

I thought I read somewhere that if an eReader has been authorized by ADE on PC, and then if you login to ADE on a Mac with the same DRM ID, then you can sideload books downloaded in ADE on the Mac to the eReader that had been authenticated on the PC. When i try to do that the books don't open, and instead get the "Protected Be DRM" warning.

I installed ADE 1.7. I've tried to sideload the books onto a PRS-350 and a T3 with the same results. The Set-up app on both readers gave the same message: "this app will not run on this OS."

Buggers...!!