UniBeast 8.3.2 UniBeast is a tool by MacMan and tonymacx86 to create a bootable USB drive from any Mac App Store purchased copy of Mac OS. This all-in-one bootable USB drive can also be used as a rescue boot drive for system recovery. NOTE: The version displayed in the splash screen is incorrect. The correct version is show in the About UniBeast screen. Please do not upload or redistribute UniBeast to any other sites.