You mean the software at
http://ebookstore.sony.com/download/ ? There is only one option there, and then it automatically downloads the E-library installer which opens a InstallShield Wizard, but before i can make any choises at all (tick the "i live in US-box") is says "This version is not supported in your region. The installation cannot continue" and terminates...
Where can I find the pure US-version?