For Kindle textbooks the best thing to do is download the book using Kindle for PC/Mac. Use an older, pre-KFX, version or a newer version with KFX disabled in order to get the book in AZW4 format. Then import that into calibre and use the KindleUnpack plugin to extract the embedded PDF file.
Quote:
Originally Posted by pdurrant
Print Replica books probably won't download in KFX format, as they are essentially PDFs.
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There is a KFX equivalent of print replica. It also includes embedded PDF, but it is more complicated to extract it from that format.