jdhardy

I happened to come across http://techartsurvival.blogspot.ca/2013/12/embedding-ironpython-in-unity-tech-art.html which uses 2.6 and may help. Also, the zip package includes 3.5-compatible assemblies in the Platforms/net35 directory. I don't know how KSP does sandboxing so there might still be issues there if it rejects banned APIs at load time, but if it rejects them at runtime you should still be OK as long as those APIs don't get called.