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Detail this asset from Unity Store: Original Link
This is a paid asset, but now you can download Smart Footstep System Free.
Smart Footstep System v1.0.2
The Smart Footstep System is a quick & easy to use solution for adding realistic footstep behavior to your First & Third Person Characters.
It comes with a variety of footstep sounds for your games and works on both Terrains & Renderers.