There's a better way to convert this eBook that will work. You will have to edit it after the conversion. Use KindleUnpack to shift the Kindle eBook to ePub. Then load the ePub in the editor and use the editor's error checker and epubcheck (editor plugin) to check for errors and fix them. In most cases, it's very easy to fix the errors.
What's happening with this conversion is that the eBook has embedded fonts and the fonts are obfuscated and Calibre is failing on the fonts.
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