Sorry, I just saw this message.
I am removing support for Mac because, as I understand it, apps must be notarized for their platform, and there is a fee for that. Since this is a free app, the cost is not justifiable. However, there is still hope. I have created a web version of the app. You can use it in any browser. Check it out here: alienrpgtools.tiesthatbindgaming.com