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I am not from Laminar Research; just a flight simmer from down under.
Have a look at my answer provided in the following link found at https://questions.x-plane.com/26595/jet-engine-settings-for-vtol-on-x-plane-11
Also have you tried downloading the aircraft into the extra aircraft subdirectory? When selecting aircraft from the screen showing all available aircraft have you ticked the box labelled "show extra aircraft from older versions" located in the top RHS corner?
This may help solve your problem.
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