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amazon has new ebook format since Kindle for Pc 1.19, new format call KFX format cause problems, we need to downgrade kindle for pc to old v1.17 or v1.24, kindle for Mac to v1.17, download ebook file in old version,

Open Option window, click Deregister button to deregister, remove all license content, close it.
delete folder “documentmy kindle content” ,
Uninstall Kindle for Pc, download old version kindle for pc 1.24.
Uncheck automatically update in options in Kindle for pc.
Re-download ebook and try again.

How to deregister Kindle for pc

Download this app from Microsoft Store for Windows 10 Mobile, Windows Phone 8.1, Windows Phone 8. See screenshots, read the latest customer reviews, and compare ratings for Amazon Kindle. Use the Kindle app to start reading from your PC or Mac. Supported Operating Systems: PC: Windows 7, 8 or 8.1, or 10. Select Download for PC & Mac. When the download completes, follow the on-screen installation instructions. Was this information helpful? Yes No Thank you for your feedback. Please select what best describes the information. Download the latest version of Kindle for Mac - Read Kindle books on your Mac. Read 46 user reviews of Kindle on MacUpdate.

For Mac

Kindle App For Mac Air

latest version kindle for Mac has this problem, you should install old version,

Kindle Download Mac

Amazon Kindle Download For Mac

deregister in Kindle for Mac, delete all content, remove app Kindle for Mac.

download old version 1.17KindleForMac-44173.dmg
uncheck automatic update in options in Kindle for Mac.
re-download ebook in v1.17 kindle for Mac
run converter and try again.