So I'm on Catalina. I had the game installed before on Mojave, and wasn't able to use 64 bit mode. To play, I ended up having to use safemode. When I upgraded to Catalina it stopped working all together. I got the ready to play green checkmark then nothing. I tried re-installing, etc. I read all the posts here, and I think what the issue was was that there were some old settings for island rum held up. I read the post by Cho, and he mentioned to get rid of island rum using app cleaner which gets rid of old preference files and such. After doing that I trashed the COH folder in applications as well.
So I seem to have gotten it to work. I used the latest Island Rum. Good luck to all my Mac using friends. There is hope!