For awhile I've been seeing the warnings from Mac OS that the Kindle app will no longer be compatible with future versions of Mac OS. I believe with High Sierra it say "may not" and now in Mojave it's changed to "will not." Will there be a new version coming out before the next version of Mac OS next September? I really don't want to have to re-purchase all the books I need in Apple Books.
As Ann said, we don't know Amazon's plans. They may issue and update to the app that is compatible. It is not a complex task, mainly switching from 32-bit to 64-bit libraries and recompiling.
Apple is also moving forward with a system called "marzipan" that will let developers using their iOS codebase to produce Mac versions of their iPhone apps. That might be a direction for Amazon to take.
If they decide to not provide a direct Mac upgrade, do you have any other devices to read your books on, like a Kindle, phone, or ipad?
Maybe the problem is with Apple not AmaZon! I’ve been with Apple from day one and am not crazy about their recent way of doing business nor the constant and ofttimes erratic behaviors! I cannot upgrade to their recent OS unless I buy a new desktop iMac! It’s working fine but I’m stuck with an old OS. Need a sèance with Steve Jobs.
Just because the MAC can't support the kindle, that doesn't mean you can't still read your books. There's always tables (including from Apple), and the cloud reader if you don't want to go the Windows route.
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There is no such thing as a stupid question!
Corollary -- so long as you read before you post and stay on topic. :)