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I use a MAC PRO.
I have used ADE for along time without major problems.
Now, I download a book from my local library and am told "your eReader is not authorized to open this book ... you previously deauthorized your reader ... visit kobo.com for more information.
I have uninstalled and reinstalled ADE 4.5 on my MAC, reauthorised the reader, and continue to get the same message.
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