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And if you are on a Mac you should really read up on Gatekeeper and App Translocation that happens when trying to open a quarantine file directly from your Downloads folder.
You should always manually drag and drop any file out of your Downloads folder before trying to invoke it. Otherwise a read-only image of it is created in /private/var/folders/mv (as is shown in your error message) that causes many/most applications to fail. Your ".epub" file is being treated as an app (could it have a malicious payload attached) exactly like that.
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