Problem downloading: unable to download: error getting license: License server communication problem: E_ACT_NOT_READY

My solution on a MacBook Pro with El Capitan

1. 1. Opened my hidden Library folder

   a. Opened Finder

   b. Pushed & Held “Option” key and clicked “Go” in the title bar (“Library” appeared)

   c. Clicked “Library” while Holding “Option” key

1. 2. Went to /Application Support/Adobe/Digital Editions
2. 3. Deleted the “activation.dat file”
3. 4. Deleted Adobe Digital Editions (I did it with Clean My Mac 3 but you probably won’t need to use it for the deletion)
4. 5. Emptied Trash
5. 6. Reinstalled Adobe Digital Editions 4.5
6. 7. Adobe Digital Editions opened authorization popup, which I filled out
7. 7. My files now open perfectly

Also having same problem. No help from the support department. I have tried the possible solution link provided by Chirag and it did not work.

Try the instructions given in following link:

http://helpx.adobe.com/digital-editions/kb/error-e_act_not_ready.html

I hope it helps.

-Chirag

I'm having the same issue! Please let me know if you figure it out!