The hidden ".import" folder inside of "Put in Strive Game Files" is also needed.
Viewing post in Aric's Expansion Rebred
Those are actually the most important files. You will need to make sure that the .import ends up merging with the existing .import file in or around the Strive.exe. I don't have a Mac so I can't actually troubleshoot with you, but there should be an existing .import file somewhere in there that it can merge with.