Convert Vectors in Right way using Extension method from any to any.

VectorExtensions.cs

public static class VectorExtensions
{

  public static Vector2 ToVector2 ( this Vector3 vector )
  {
    return (Vector2)vector;
  }

  public static Vector2 ToVector2 ( this Vector4 vector )
  {
    return (Vector2)vector;
  }

  public static Vector3 ToVector3 ( this Vector2 vector )
  {
    return (Vector3)vector;
  }

  public static Vector3 ToVector3 ( this Vector4 vector )
  {
    return (Vector3)vector;
  }

  public static Vector4 ToVector4 ( this Vector2 vector )
  {
    return (Vector4)vector;
  }

  public static Vector4 ToVector4 ( this Vector3 vector )
  {
    return (Vector4)vector;
  }

}