Authorization and de-authorization

I downloaded Adobe Digital Editions almost a week ago since I needed that to read a digital book called Principles of Marketing Scandinavian Edition. When I first downloaded it I authorized my computer with my Adobe ID (the same one as I am posting from) but I made something wrong and I could not use Digital Editions by phone or iPad.

This evening I deleted the authorization on my computer (the authorization information was in grey text, non-clickable before that) and re-authorized now when I try to open or get access to the book again through the computer it says that the license is used by another account... What can I do? The book was not cheap as it is for college studies so I appreciate any help in accessing the book again.

Sincerely,

Sandra