ENGCOM-6047: Resolved Issue #24785 #24800

 - Merge Pull Request #24800 from drpayyne/magento2:issue-24785
 - Merged commits:
   1. a289dc4
   2. 68b7c4a
   3. c1ddc0f
   4. 0e791c3
   5. a2919d9

Author: magento-engcom-team

app/code/Magento/Downloadable/view/frontend/web/js/downloadable.js

@@ -10,6 +10,7 @@ define([
     'jquery-ui-modules/widget',
     'Magento_Catalog/js/price-box'
 ], function ($) {
+    'use strict';
 
     /**
      * Downloadable widget
@@ -78,7 +79,7 @@ define([
          * @private
          */
         reloadAllCheckText: function () {
-            let allChecked = true,
+            var allChecked = true,
                 allElementsCheck = $(this.options.allElements),
                 allElementsLabel = $('label[for="' + allElementsCheck.attr('id') + '"] > span');