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As of Unity 5.5, the following public functions are deprecated for the LineRenderer;

SetColors
SetWidth
SetVertexCount

These are last documented in version 5.4 of the Unity Scripting API documentation;
https://docs.unity3d.com/540/Documentation/ScriptReference/LineRenderer.html

These public functions are used within DrawForces.cs, which is provided within the NL02 Newtons Laws Assets.unitypackage, linked from Section 2, Lecture 7 (at time of writing). Additionally, these also appear within the PhysicsEngine.cs file, after the changes are made in Section 2, Lecture 13, and subsequently appear in the repository here.

At the time of writing, Unity 2018.2.2f1 still supports them but warns that they are deprecated.

The following lines of code can be used to replace the deprecated function calls and resolve this issue for more recent versions of Unity, 5.6 onwards;

lineRenderer.startColor = Color.yellow;
lineRenderer.endColor = Color.yellow;
lineRenderer.startWidth = 0.2f;
lineRenderer.endWidth = 0.2f;

and

lineRenderer.positionCount = numberOfForces * 2;

hi, I am learn this course form udemy now . But I find something weird.
in CalculateGravity()
"physicsEngineA != this" is seemed not necessary.Instance of UniversalGravitation is never equal Instance of PhysicsEngine. on the other world "physicsEngineA != this" is always true.

And if There is only one Instance of UniversalGravitation in the game world.
Just use "physicsEngineA !=physicsEngineB" can get the correct result.

Hypothesis physicsEngineArray={a,b,c}
then
{a} is applied force from
{b,c}

{b} is applied force from
{a,c}

{c} is applied force from
{a,b}

But The object can be dynamically generated, so I think need a global container to memory all instance of PhysicsEngine. and all physicsEngine need to add his self to the container in function start.