Download macOS Catalina Description: To get a working Mojave installer onto a USB flash drive it must first be formatted into a scheme that allows for an EFI Partition.If your X-Plane 11 setup is heavily enhanced with add-ons, you may want to remain with Mojave. Catalina & X-Plane 11 While X-Plane 11 is compatible with Catalina, a number of users have reported problems with third party add-ons and Catalina’s increased level of software security.