Which software are you using? Epubor Ultimate? 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 you are still failed, please contact us via support@epubor.com to get further assistance.

I have Mac Sonoma 14.2.1 on a 2019 iMac with 1gi hd and 24gb memory. When I open the installed appp, it will launch and after 2-4 seconds it will crash.
Any suggestions?