My eReader and Adobie de

So I belong to KOBO  I have installed everything I am supposed to.  When I go to download my books to my eReader I get this message....Unable to download   Error getting License Server Communication Problem  E-lic Already fulfilled by- Another-User.  I have written KOBO and called them and they are of no help.  I am using windows 10.  I have installed Adobie DE , Authorized my computer.  I have been trying for over a week to get things right.  Now I am at a total lost....HELP!