What you get is a versatile ground material with a number of options to change and randomize grass, mud, and tiles. The artist notes that custom alphas can be plugged into the .sbsar node if you want to control the shape of the stone.
UFDefaultMaps.zip contains 5 already exported 4k png Textures (AO, baseColor, height, normal, roughness) of Material at default settings.
Please note that the material is compatible with Substance Engine v6, made in Substance Designer 2018 v3.0.
You can learn more and get the pack here.