Onan EC-30 software update (version 3.15)

Cummings told me today that I need to update the software on my Onan EC-30 (Energy Command 30) from version 3.02 to 3.15 to fix issues with the Auto Start stopping & restarting every few minutes...even though I only purchased it 5 weeks ago.

Does anyone know how to get the Onan EC-30 software and install it. Cummings (the manufacture) does not. I have a MacBook.

Thanks,
Kristopher