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If I understand correctly, you downloaded a book from Amazon onto your Mac's hard drive, and when you went to add it to calibre, the book was greyed out in the dialog box that pops up when you go to add the book into calibre.
I've found that this happens (a) when you click the Add to calibre button prior to the file downloading completely, or (b) if the file doesn't download correctly.
Close the Add to calibre dialog box and try again once the file is completely downloaded. If that doesn't work, try downloading the file from Amazon again.
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