Cursor.setCursor hotSpot to center of image

Here is a full working example in C#:

 using UnityEngine;
 using System.Collections;
 
 public class MouseScript : MonoBehaviour {
 
     public Texture2D cursorTexture;
     private Vector2 cursorHotspot;
     
     // initialize mouse with a new texture with the
     // hotspot set to the middle of the texture
     // (don't forget to set the texture in the inspector
     // in the editor)
     void Start () {
         cursorHotspot = new Vector2 (cursorTexture.width / 2, cursorTexture.height / 2);
         Cursor.SetCursor(cursorTexture, cursorHotspot, CursorMode.Auto);
     }
 
     // To check where your mouse is really pointing
     // track the mouse position in you update function
     void Update () {
         Vector3 currentMouse = Input.mousePosition;
         Ray ray = Camera.main.ScreenPointToRay (currentMouse);
         RaycastHit2D hit = Physics2D.Raycast (ray.origin, ray.direction);
         Debug.DrawLine (ray.origin, hit.point);
     }
 }