it would be better to have a c4doctanelog, instead of the osx log.
What about materials used in the scene?
Have you converted them all to Octane?
Please, open the scene, then go to c4doctane Settings/Other tab, and, at the bottom of the panel, enable all the Log option checkboxes:
Then, load the scene in Live View until crash, and share the c4doctanelog.txt file that you find in c4doctane directory, or in the path specified in Settings/Other panel, thanks.