diff --git a/modules/backend/layouts/_head.htm b/modules/backend/layouts/_head.htm
index d4b2518b8..6b0bb19f5 100644
--- a/modules/backend/layouts/_head.htm
+++ b/modules/backend/layouts/_head.htm
@@ -59,10 +59,10 @@
         if (location.protocol === 'https:') {
             // Unregister all service workers before signing in to prevent cache issues, see github issue: #3707
             navigator.serviceWorker.getRegistrations().then(
-                function(registrations) {
-                    for (let registration of registrations) {
+                function (registrations) {
+                    registrations.forEach(function (registration) {
                         registration.unregister();
-                    }
+                    });
                 }
             );
         }
diff --git a/modules/backend/layouts/auth.htm b/modules/backend/layouts/auth.htm
index 5b66888aa..344e11e37 100644
--- a/modules/backend/layouts/auth.htm
+++ b/modules/backend/layouts/auth.htm
@@ -46,10 +46,10 @@
                 if (location.protocol === 'https:') {
                     // Unregister all service workers before signing in to prevent cache issues, see github issue: #3707
                     navigator.serviceWorker.getRegistrations().then(
-                        function(registrations) {
-                            for (let registration of registrations) {
+                        function (registrations) {
+                            registrations.forEach(function (registration) {
                                 registration.unregister();
-                            }
+                            });
                         }
                     );
                 }
diff --git a/modules/system/controllers/updates/_list_toolbar.htm b/modules/system/controllers/updates/_list_toolbar.htm
index 0de962934..fc32bc329 100644
--- a/modules/system/controllers/updates/_list_toolbar.htm
+++ b/modules/system/controllers/updates/_list_toolbar.htm
@@ -6,6 +6,11 @@
         data-handler="onLoadUpdates">
         <?= e(trans('system::lang.updates.check_label')) ?>
     </a>
+    <a
+        href="<?= Backend::url('system/updates/install/themes') ?>"
+        class="btn btn-success oc-icon-plus">
+        <?= e(trans('system::lang.themes.install')) ?>
+    </a>
     <a
         href="<?= Backend::url('system/updates/install') ?>"
         class="btn btn-success oc-icon-plus">