Please make sure you have selected correct ebook vendor
I have selected Adobe ID. I have recently bought an e-book but it's not in my library and the vendor is not in the list anyway. My library includes "Getting started with Adobe..."
I think you must have created, an Adobe id.
try to first login at Adobe.com with your id just to verify your credentials.
Then, Authorize ADE as: Help->Authorize Computer
Download the book to ADE
Thanks. My password is OK but it seems my id is my e-mail address (not the ID I have previously pick up)