What is this about? The last update of FM 2020 for macOS introduced some security changes that prevent tools like FMRTE from accessing the game. Those changes use the macOS System Integrity Protection (https://support.apple.com/en-us/HT204899), which is enabled by default in all macOS installations.   Why is FMRTE affected by this? System Integrity Protection (SIP) is designed to protect your system from malicious software.    One app accessing another app memo