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@stephenBlair I downloaded the trial version of the Arnold render for c4d plugin. I followed the instructions, restarted cinema c4d and my macbook. which is the macbook pro 15 2018
Which version of C4DtoA did you download? You can try to start Cinema 4D from a terminal, so it prints out some startup log which may give us a clue why the plugin is not loaded:
And you need at least CINEMA 4D R20.057
Where is C4DtoA installed?
I've seen machines with a CINEMA 4D folder under the User's home folder, and under the /Applications too