I installed on my Mac (10.5.7) and it went well. Everything worked except for the authorizing my reader to the eBook store. I have a Sony 505, but everytime the store attempts to register it, I get the message: "Unable to access eBook Store. Check your network setting to ensure you have access to the internet."
Which is silly because I am able to shop, browse through the store and even purchase, but I just can't register my reader, so the book I just bought won't work...