I bought Marvin 2. I then bought Marvin 3. Both versions are alive and well, running on the same iPad. Both versions have their libraries fully intact. Marvin lets you easily copy books from M2>M3 and from M3>M2.
Are you saying you can't run the M2 app or that it will open but it is devoid of books? Are both M2 and M3 missing all books?
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