So what does the "SU2KT: Replace by proxy object" and "Export options: instanced" do? Does Thea have a separate extension or is SU2KT used for both applications?

I'm not really sure where to post this question.

I've recently started using kerkythea, and although it mostly seems pretty intuitive, I don't really understand how kerkythea instances work.

Here's what I have:
Several files each containing 1 high poly tree
Main file containing several low poly trees

Here's what I want:
When kerkythea renders the main file, all low poly trees are replaced by their high poly equivalents (in the other files)

I figured kerkythea "instances" may have something to do with this.
So is it possible to do this, and how?