help downloading an e-book to adobe digital editions

I have a book for my college course I purchased through academic pub.  The site required me to download Adobe Digital Editions, which i did.  However, when I click to download the book, I get a message that says "Adobe Reader could not open 'URLLink(10).acsm' because it is either not a supported file type or because the file has been damaged (for example, it was sent as an email attachment and wasn't correctly decoded".