Originally Posted by jhowell

That is a popular book. I can't explain why it isn't downloading for you. You could try contacting Amazon customer service via chat and asking them to "push" the latest version of that book to your account, in case there was an update to it after your purchase that affected compatibility with different devices.

Originally Posted by jhowell

If those books imported into calibre as KFX format and not MOBI or AZW3 then you must have the KFX Input plugin installed. In that case you inadvertently used method #4 in the post you mentioned.