Probably I am missing something very obvious...
- Update Brainstorm
- Configure the process
Import MEG/EEG: Existing epochs
in order to obtain what you want (and make sure you really have existing epochs in the file, otherwise you need to select the "Events" process) - Generate the script for calling the process
Import MEG/EEG: Existing epochs
- Do not try to modify the list of parameters (this "GetAllEpochs" you added is not linked to anything). The process executed from the GUI or from a script do exactly the same thing. If there are issues that are not available in the process options, then they won't be available from a script.
Starting by reading the Scripting tutorial would probably help you:
https://neuroimage.usc.edu/brainstorm/Tutorials/Scripting#Starting_a_new_script