Last commit commented out the permission this comments out the menu.

core/install/app_menu.php

@@ -1,10 +1,10 @@
 <?php
 
-$apps[$x]['menu'][0]['title']['en-us'] = "Install";
-$apps[$x]['menu'][0]['uuid'] = "75507e6e-891e-11e5-af63-feff819cdc9f";
-$apps[$x]['menu'][0]['parent_uuid'] = "594d99c5-6128-9c88-ca35-4b33392cec0f";
-$apps[$x]['menu'][0]['category'] = "internal";
-$apps[$x]['menu'][0]['path'] = "/core/install/index.php";
-$apps[$x]['menu'][0]['groups'][] = "superadmin";
+//$apps[$x]['menu'][0]['title']['en-us'] = "Install";
+//$apps[$x]['menu'][0]['uuid'] = "75507e6e-891e-11e5-af63-feff819cdc9f";
+//$apps[$x]['menu'][0]['parent_uuid'] = "594d99c5-6128-9c88-ca35-4b33392cec0f";
+//$apps[$x]['menu'][0]['category'] = "internal";
+//$apps[$x]['menu'][0]['path'] = "/core/install/index.php";
+//$apps[$x]['menu'][0]['groups'][] = "superadmin";
 
 ?>