MacOS Catalina - Launcher Can't Run

[GilroyKilroy]

This literally just happened to me as well. Im going to uninstall and reinstall Mojave to see if that works. Unfortunately Apple changed the way it does Time Machine so its practically non functional, I tried to revert only to find that none of my prior snapshots were saved...so I'll post back if that's a viable option.

I decided it was easiest to just create a Mojave volume to boot into. You have to copy the game itself, and all parts (like from ~/Library/Application Support/FINAL FANTASY XIV ONLINE and ~/Preferences/com.square-enix.finalfantasyxiv.plist), to the volume. The biggest issue was finding the Mojave installer to install with. Google is your friend for that ("mojave installer download").