Replacing format of file already in Calibre
I downloaded a bunch of O'Reilly books after they announced that they had updated most of the ePub editions, and now I want to replace the editions that are in Calibre. Does it ignore the new edition entirely if I select No when it asks me if I want to add the duplicates? I added all of the duplicates, and now I'm merging the two editions, but I'd like to know if there's an easier way to do this.
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