Update

Assets/Invector-3rdPersonController/Basic Locomotion/Scripts/Generic/Utils/vLookAtCamera.cs

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+using UnityEngine;
+namespace Invector
+{
+    public class vLookAtCamera : MonoBehaviour
+    {
+        [Tooltip("Align position to stay always on top of parent")]
+        public bool alignUp = false;
+        [Tooltip("Height of alignment on top of parent \n!!(Check alignUp to work)!!")]
+        public float height = 1;
+        [Tooltip("Detach of the parent on start \n!!(if alignUp not is checked, the object not follow the parent)!!")]
+        public bool detachOnStart;
+        [Tooltip("use smoth to look at camera")]
+        public bool useSmothRotation = true;
+        protected Transform parent;
+        public bool justY;
+        internal Camera cameraMain;
+        void Start()
+        {
+            if (detachOnStart)
+            {
+                parent = transform.parent;
+                transform.SetParent(null);
+            }
+            cameraMain = Camera.main;
+        }
+
+        private void OnEnable()
+        {
+            cameraMain = Camera.main;
+            Align(false);
+        }
+        void FixedUpdate()
+        {
+            Align(useSmothRotation);
+        }
+        void Align(bool useSmooth)
+        {
+            if (alignUp && parent)
+                transform.position = parent.position + Vector3.up * height;
+            if (!cameraMain) return;
+            var lookPos = cameraMain.transform.position - transform.position;
+            lookPos.y = 0;
+            var rotation = Quaternion.LookRotation(lookPos);
+            if (useSmooth)
+            {
+                transform.rotation = Quaternion.Slerp(transform.rotation, rotation, Time.deltaTime * 4f);
+                transform.eulerAngles = new Vector3(justY ? 0 : transform.eulerAngles.x, transform.eulerAngles.y, 0);
+            }
+            else
+            {
+                transform.eulerAngles = new Vector3(justY ? 0 : rotation.eulerAngles.x, rotation.eulerAngles.y, 0);
+            }
+        }
+    }
+}