I'm not sure. ADE is necessary if you have DRM ePub books but, at least in the computer, yo don't need it for non DRM ePub books. If you have converted them, I think that ADE works only like a viewer. I don't know if you have to use it to transfer them, but I don't think so.
I do what you says a lot, and I only downloaded ADE when I bought a DRM ePub book.
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