Latest version crashes on OSX 14.2.1

Please uninstall completely the current version of Epubor Ultimate from your Mac, then reinstall the latest version from the link below.

https://epubor.com/ultimate-download.htm#os_Mac

If there is still the same issue, you can also try to open "Terminal" on your Mac, then run the command below:
cd ~/.Ultimate && sed 's/"enable_device": true/"enable_device": false/g' app_settings > app_settings_tmp && mv app_settings_tmp app_settings

If this issue is still not fixed, please contact us via support@epubor.com.
More fixes on kindle drm removal failed, please read: https://www.epubor.com/kindle-kfx-drm-remove-failed-and-solution.html