title_body: Why can't I download the same books to Adobe Digital Editions and Overdrive apps?
upvoted_answer: Use your Overdrive account to authorize ADE:
  
  "If you plan to use ADE and our mobile app, we encourage you to use your OverDrive account to authorize ADE. That way, you won't run into authorization issues when you read the same eBooks on your mobile device and on your computer. You can sign up for an OverDrive account through our mobile app or on overdrive.com."