FxFactory Requires System Integrity Protection (SIP)
FxFactory requires System Integrity Protection (SIP in short) to be enabled on your Mac in order to function properly. SIP is one of the technologies employed by GateKeeper to make sure only software from trusted sources is running on your Mac.
What about Hackintoshes?
FxFactory does not support generic PC hardware that has been made to run unofficial versions of macOS. Often times, these configurations can only run software when GateKeeper has been turned off entirely.