Quote:
Originally Posted by bertofa

I run Calibre 4.13 on a MacBook Pro 2017 13" with MacOS Catalina 10.15.4. ...
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Quote:
Originally Posted by DNSB
... It seems rather likely that your Mac did not have an early enough version of Kindle for Mac to allow books to be downloaded as AZW (mobi or azw3) so you are downloading a KFX ...
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Unfortunately, bertofa is running Catalina, which requires K4Mac 1.25 or later.
It may be too late since Catalina is already installed, but if you have backups of older versions, you might be able to get it working. See:
https://www.mobileread.com/forums/sh...&postcount=508