It seems amazon kindle has changed something in the newly published Kindle books, so it requires the latest kindle app to download it. For the ebooks published in 2023, here are 2 solutions to solve this problem:
1.If you have any Kindle device (kindle fire or kindle e-ink device) registered with your Amazon account.
Please download the Kindle books via "download and transfer via USB" and then remove kindle drm with epubor ultimate.
2. If you don't have a Kindle e-ink device, we recommend our new product Kindle Converter to decrypt and convert the Kindle books published in 2023.
Please contact us via support@epubor.com, then we will send you the user guide to help you solve this problem Thank you!
Best regards,
Epubor Team
