Nature Shaders
Nature Shaders is available on the Unity Asset Store.
Nature Shaders Essentials
Nature Shaders Essentials is a subset of Nature Shaders and contains the most essential features. It is included with all other Visual Design Cafe assets, such as Nature Renderer and Open World Nature Kit and can't be downloaded separately at the moment.
What's the difference?
See a list of features and differences on the following page:
https://www.visualdesigncafe.com/nature-shaders/comparison/