@hanny so the app does not crash on startup. It crashes when you click on business name within Manager. Is that correct?
In that case, something would be wrong in relation to SQLite library. There are many Linux distributions. Typically, if AppImage works on Ubuntu and Fedora, I just assume it’s good enough since that should cover over 50% Linux desktop users.
Can you try if you can get free trial of Server edition going? If not, at least you should be able to see some error in console. That would help narrow down the issue.
Try tutorial here: https://www.manager.io/server/installation/ubuntu/
But only follow what’s in Downloading Manager Server section. Then just launch…
/usr/share/manager-server/ManagerServer
Once launched, navigate to http://localhost:8080 and see what happens.