Purchased a book recently for school, and it came with a digital download. So I downloaded it, and it was working fine. Go to open the book today and now I get that error. I'm opening the book on the same computer I authorized it to be open on, and Ive never deleted the file or anything.. just had to do more reading today. Running on a Macbook Pro. Tried re-authorizing this computer and that did nothing. Any help is great, this is a bit urgent as I need to do more reading for one of my university classes.
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