It appears that since I upgraded to Mac OS Serria High and then Mojave, the mac editor doesn't open at all.
I'm desperately looking for help. Is this happening to you?
I have been advised to download the installer again, but it doesn't work.
It stops and crashes while it is verifying the application.
I have a game to finish
EDIT:
I found the answer here!
Please login to see this link.