With the recent updates to Unity (2018+) we are no longer building in Mono, but in .Net 4.x IL2CPP - api comparability level .Net 4.x. This plugin (that uses program# and Jurassic) no longer compiles. I believe the problem may lie in the fact that IL2CPP does not support JIT.
We would like answers, and a plan to move forward.
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Having worked as a Unity developer over the past 1 and half year at Zynga games and being a game developer myself, I think I would be best suited for this purpose of analyzing the plugin and resolving your requirement.