You are! I'm David, I remember that email exchange (I forwarded the thread to your gmail) :) I'm installing Unity to see if I can make a new build for Mac. It's difficult for me to get access to a Mac so I can test it, but I will try to help!
Here’s another note. He suspects that this build may have been made for an older type of Mac with Intel processors and said this could be what’s causing the problem: “the new Mac’s are using what’s known as the silicon series of microprocessors, the current ones are basically the M3, M4 and M5. I’ve got the M4.”