Mac users look here

If you’re using a Mac then some of you may run into issues with SASL, Xlua or even all plugins being blocked. If you cannot find the custom Cowan Sim menus, or cannot remove the accessories, then that is a sure sign that the code required to use the aircraft is not running. You will need to add X-Plane 11 to the safe list in your Mac security settings. After doing so, then all plugins will run fine, including all of your other aircrafts with plugins.