I've gotten that error message before on newly-acquired titles from various sources that have never been downloaded. Usually, all I had to do was wait a while and retry with the same file, or get a fresh ACSM from the same source and try again, and that's always “fixed” the issue up until now (excepting those rare items which I actually did get on separate Adobe ID accounts).
I think sometimes it happens when the server is just being glitchy and/or you're trying to get too many things in too short a time and overload it.
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