Commenting Advanced -> Install menu until its reason developer that added the menu explains its purpose.

core/install/app_config.php

@@ -19,10 +19,10 @@
 		$apps[$x]['description']['pt-br'] = "";
 
 	//permission details
-		$y = 0;
-		$apps[$x]['permissions'][$y]['name'] = "install";
-		$apps[$x]['permissions'][$y]['menu']['uuid'] = "75507e6e-891e-11e5-af63-feff819cdc9f";
-		$apps[$x]['permissions'][$y]['groups'][] = "superadmin";
-		$y++;
+		//$y = 0;
+		//$apps[$x]['permissions'][$y]['name'] = "install";
+		//$apps[$x]['permissions'][$y]['menu']['uuid'] = "75507e6e-891e-11e5-af63-feff819cdc9f";
+		//$apps[$x]['permissions'][$y]['groups'][] = "superadmin";
+		//$y++;
 
 ?>