Render Settings missing

I downloaded an old project from a video tutorial which was created on an older version of Unity (from October 2014). The project is located here BreakfastWithUnity/Assets/14ZeroG at master · PushyPixels/BreakfastWithUnity · GitHub

When I opened it, Unity upgraded the project to the current version (my case that is 5.5.1).

The project has a real cool grid render skybox.

My question: For the life of me I cannot find where this grid Skybox is in the project. It is not attached to the camera, its not on any object in the hierarchy! How is it showing up in the project.

When I look at the video he inserts it into the “Render Setting” which no longer are in the menu. What gives, how is this gridSkybox in the project??

With that scene open, at the top of Unity, select Window->Lighting. The first field should contain the skybox used by cameras that use the “Skybox” clear flag in your scene.