Solution: Deauthorize and reauthorize Adobe Digital Editions.
For Adobe Digital Editions (Windows PC and Mac)
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Deauthorize Adobe Digital Editions (from library view, CTRL+SHIFT+D or CMD+SHIFT+D).
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If you have previously downloaded your book to another computer, please use the same Adobe ID when authorizing subsequent devices.
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For Bluefire Reader (iOS and Android mobile devices), Click "Info" at the bottom right of Bluefire Reader.
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Click "Deauthorize" and confirm.
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Click "Authorize" and enter your Adobe ID credentials.
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After following the above steps, please try downloading and opening your book again.
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Verify that your computer has access to the internet. If it does, check any proxy, firewall, or antivirus settings preventing Adobe Digital Editions from accessing the internet.