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I'm not with Laminar Research, just a fellow simmer in the UK, but for the default King Air C90 in X-Plane 11, you should be seeing the photo below.
If you're not seeing this, what are you seeing exactly, is it a 'silhouette' of an aircraft? Could you please upload a screen image of what you see?
I am not from Laminar Research either; just a flight simmer from downunder.
I addition to what Greengolfer15 has advised have you installed the add-on aircraft correctly ie in the "aircraft" folder?
Have a look at the following link found at https://www.youtube.com/watch?v=V4RjIxrhkXs from Michael Brown of XForcePC. Michael runs a business building PCs predominantly for X-Plane. His business is supported by Laminar Research as the only builder of PCs suitable for X-Plane within the USA.
You may need to click the "box" for additional aircraft as indicated by Michael.
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