Missing Assembly References.

I recently acquired an addon for unity which I was very excited to use. However, it's causing all kinds of errors in the console and I was wondering if these errors were on my end?

The addon is Aura 2, it was released only recently. I can't find any help for this issue, nobody seems to be having this problem.

The errors are endless. Every time I attempt to manually remedy one an entire new string of them appear.

This is just a few of them, the list really does go on and on though:

"Assets/Aura 2/System/Code/Editor/Editors/AuraQualitySettingsEditor.cs(297,90): error CS1061: Type UnityEditor.SerializedProperty' does not contain a definition for vector3IntValue' and no extension method vector3IntValue' of type UnityEditor.SerializedProperty' could be found. Are you missing an assembly reference? Assets/Aura 2/System/Code/Editor/Editors/SceneViewToolbox.cs(1760,65): error CS1061: Type UnityEngine.Plane' does not contain a definition for ClosestPointOnPlane' and no extension method ClosestPointOnPlane' of type UnityEngine.Plane' could be found. Are you missing an assembly reference? Assets/Aura 2/System/Code/Editor/Editors/SceneViewToolbox.cs(1861,65): error CS1061: Type UnityEngine.Plane' does not contain a definition for ClosestPointOnPlane' and no extension method ClosestPointOnPlane' of type UnityEngine.Plane' could be found. Are you missing an assembly reference? Assets/Aura 2/System/Code/Editor/Editors/Texture3DTool.cs(233,61): error CS1061: Type UnityEngine.Texture2D' does not contain a definition for wrapModeU' and no extension method wrapModeU' of type UnityEngine.Texture2D' could be found. Are you missing an assembly reference? Assets/Aura 2/System/Code/Editor/Editors/Texture3DTool.cs(233,35): error CS1061: Type UnityEngine.Texture3D' does not contain a definition for wrapModeU' and no extension method wrapModeU' of type UnityEngine.Texture3D' could be found. Are you missing an assembly reference? Assets/Aura 2/System/Code/Editor/Editors/Texture3DTool.cs(234,61): error CS1061: Type UnityEngine.Texture2D' does not contain a definition for wrapModeV' and no extension method wrapModeV' of type UnityEngine.Texture2D' could be found. Are you missing an assembly reference? Assets/Aura 2/System/Code/Editor/Editors/Texture3DTool.cs(234,35): error CS1061: Type UnityEngine.Texture3D' does not contain a definition for wrapModeV' and no extension method wrapModeV' of type UnityEngine.Texture3D' could be found. Are you missing an assembly reference?"