Kevin,
you cannot try the program itself, because you have to start sbitx first, then the desired application, otherwise the error message will appear. If you start it without sbitx (radio), an error message will appear.
If you want to change the application, first reboot the OS, then rebuild the sbitx and run applications.
The 64-bit version was 3.02 at the beginning of March, and a lot has changed since then. Currently, image has v3.1 and you can install 4.0 on it.
--
Gyula HA3HZ
HA3HZ