The asset is working on 2020.1.0b13 but I get this warning
Found a duplicate curve binding in Controller "ThirdPersonControllerDemo" with the name "LegIndex". This may result in unexpected behaviour.
UnityEngine.GUIUtilityrocessEvent(Int32, IntPtr, Boolean&)
Which at the same times makes it not being able to view the transitions in the animator:
It's probably a unity bug, but it's annoying not knowing when/if they'll fix it.
The Inspector is not displaying the state and transition properties once it is copy/pasted or duplicated. repro: - open attached pro...
It's this problem that appears as solved, but isn't, the workaround they provide is "you can open the Animation Controller externally (via a text editor) and change the m_ObjectHideFlags property for the affected states from 3 to 1".