Unable to transfer book from ADE 4.5 to Kobo Aura

I'm running ADE 4.5.  I believe it's successfully authorised as that choice is greyed out.  I'm trying to drag and drop a book from ADE to my Kobo Aura but it indicates I have no permission.  Have tried to reinstall ADE but it indicates it's already running.  Would HUGELY appreciate thoughts.  Many thanks.@