Here’s some notes and details from the team with regards to the changes that come with KSP  1.8.0 Unity Upgrade Summary KSP now runs on Unity 2019.2.2f1. DX11 support. DX9 no longer supported. .NET 3.5 is deprecated. So we switch it up to .NET4.x. .NET 4 full API. Now supporting C# 7.3 with Roslyn Compiler. Though we recommend you consider performance and Garbage generation within Unity when writing your code. GPU instancing support. PhysX 3.4.2 up