DEVONagent and Catalina
If you are a DEVONagent user and plan to upgrade to macOS Catalina we recommend that you wait a moment before you hit the Upgrade button. There’s a minor incompatibility that keeps the application’s splash screen from being closed. You can expect a free maintenance update for DEVONagent that addresses this issue later this month.
Please see also the following posts about the 64 bit transition and other possible incompatibilities with macOS Catalina: