USD runtime import not working

AFAIK you need to download the source version of the engine.
You do not need to modify the UnrealGame.Target.cs.

I think you need to:

  • add your project folder somewhere next to the Unreal “Engine” folder,
  • modify the .Target.cs file in your project to add the FORCE_ANSI_ALLOCATOR=1 settings
  • regenerate the project files so that your project is added in the solution
  • Open solution in Visual and build your project