Update

Assets/Invector-3rdPersonController/ItemManager/Scripts/vItemAmountWindow.cs

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+using UnityEngine;
+using UnityEngine.UI;
+namespace Invector.vItemManager
+{
+    public class vItemAmountWindow : vMasterWindow
+    {
+        public vItemWindowDisplay itemWindowDisplay;
+        public GameObject singleAmountControl;
+        public GameObject multAmountControl;
+        public Text amountDisplay;
+
+        protected override void OnEnable()
+        {
+            base.OnEnable();
+            if (itemWindowDisplay)
+            {
+                if (itemWindowDisplay.currentSelectedSlot.item)
+                {
+                    singleAmountControl.SetActive(!(itemWindowDisplay.currentSelectedSlot.item.amount > 1));
+                    multAmountControl.SetActive(itemWindowDisplay.currentSelectedSlot.item.amount > 1);
+                    if (amountDisplay)
+                        amountDisplay.text = (1).ToString("00");
+                    itemWindowDisplay.amount = 1;
+                }
+            }
+        }
+        public virtual void ChangeAmount(int value)
+        {
+            if (itemWindowDisplay && itemWindowDisplay.currentSelectedSlot.item)
+            {
+                itemWindowDisplay.amount += value;
+                itemWindowDisplay.amount = Mathf.Clamp(itemWindowDisplay.amount, 1, itemWindowDisplay.currentSelectedSlot.item.amount);
+                if (amountDisplay)
+                    amountDisplay.text = itemWindowDisplay.amount.ToString("00");
+            }
+        }
+    }
+
+}