Nice… SDK is up to date and x64 set (I forgot) so it should work now… if you open your Unity Project, then NuGet will not work ? My tip was not to go copy directories manually, much better is the official way: go rightclick on your References and choose manage Nuget packages… with VS, if you try to get things complete with copying files,. you will not get all dependencies ! And Nuget also checks for version differences.
btw I am not familiar with Unity. It is programmed in C# but I don’t know the dependencies.
Have you read this ? there’s example code… I put a like right away !!