One hint that may make ADE easier to use when downloading epubs and pdfs. Not sure if it works this way on Mac, but it's sure better on Windows.
Have Digital Editions open. Download your book, but when the interim box allowing "save" or "open" appears, choose "open" This should open the ebook in ADE, and you should see it "authorizing" it. This also "saves" the ebook at the same time in the folder my documents\my digital editions. You can then drag it to your ereader or Calibre.
cheers
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