Download Advanced Rock Pack 1 Free Unity. 

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Pack support unity:
– Unity 5.6
– Unity 2017
– Unity 2018
– Unity 2018 LW RP 4.9+
– Unity 2018 HD RP 4.9
– New unity terrain 2018.3+ support
– Unity 2019
– Unity 2019 LW RP 5.7+
– Unity 2019 HD RP 5.7+