If you are still using kindle 1.24 to download kindle books, lucky for you. Why? Because from kindle 1.25, kindle books are not able to be cracked because of the harden KFX2 DRM. As for ebook user, there are slight differences between kindle for PC 1.24 and the latest kindle version （kindle 1.28 or 1.30) that you can just ignore. Starting in October 2020 Kindle for PC has become more aggressive about updating itself, even if the option to automatically install updates is deselected.
How to deal with this new kindle update? You can block automatic updates for black automatic updates.
