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I am not with Laminar Research; just a flight simmer from downunder.
Unfortunately X-Plane 10 is a totally different package to X-Plane 11. Many add-on aircraft usable in XP10 cannot be used in XP11.
Your aircraft is a 3rd party add-on.
You may be lucky if you load the software into Planemaker (supplied with X11) and then save the aircraft file(s) and try to use in XP11. For some aircraft it does work
Have a look at the link from Michael Brown found at https://www.youtube.com/watch?v=V4RjIxrhkXs In particular consider the message regarding the development date.
You should also contact the developers, Virtavia, regarding any update(s).
Like you I am interested in Military aircraft, particularly the Caribou and the C130 aircraft.
Try the following site for updated or other developers for you aircraft of interest found at X-Plane.org
This site is not connected with Laminar Research (X-Plane.com) and is a dedicated site just for X-Plane flight simmers. I have just noticed that they have information for just under 40,000 references.
To give the site o good search you need to register.
Have a look at the answer supplied by Ron (Captron) in the following link found at https://questions.x-plane.com/24031/airplane-model-incompatibilities-between-x-p-v10-%26-v11?show=24978#c24978
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