When right-clicking "Optimizers" in the "Solvers" folder of the "Resources" Tree, nothing shows up after hovering over "Add".
I am following the Lunar Fly-By tutorial, and it assumes I have the VF13ad optimizer files? I tried manually adding/creating the optimizer by adding the provided text to the script of the mission that I'm working on, but that gave errors. There is another bug which has those errors, but no solution was provided and it was closed with no explanation.
I attempted to search for plugins for GMAT, but all the links point to an old 2013 site that contains no files.