I don't use a Mac, but I've been hearing a couple of stories about the latest iOS update making certain applications unable to open again. Kind of like Windows 10 not letting applications that were once accessible not run again after the upgrade.
I honestly don't know how to fix this, since other solutions didn't work. I can suggest that you wait it out until you receive further system updates, because Apple might fix this. Or maybe try reinstalling... It might not work, but since it's an imported application from Wine it could? idk. Since it's security-wise then I don't think this can be helped for now? I might be wrong. I never used a Mac computer for long-term use.
Since the only creator of this game is gone, FH can't be remade. Contacting apple is another thing, though.