I am not with Laminar Research; just a flight simmer.
X-Plane 11 and X-Plane 10 are totally different packages just like a toyota car and a mercedes car. What aircraft have been developed for one system may not run on the other system.
You will have to purchase a X-Plane 10 package to run your selected aircraft. The XP10 package can be found at the following link https://www.x-plane.com/?s=purchase+X-Plane+10
A word of warning. If and when you do purchase XP10 make sure you do not mix XP10 files with your existing XP11 files. Create a new directory and make sure it is on the desktop or on a dedicated drive. Never mix into your operating system files
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