Trying to remove install.php after update

system/admin/views/updated-to.html.php

@@ -2,4 +2,9 @@
 <h3>Updated to<h3>
 <h2>[<?php echo $info['tag_name']; ?>] <?php echo $info['name']; ?></h2>
 <p><?php echo \Michelf\MarkdownExtra::defaultTransform($info['body']); ?></p>
-<?php require_once "system/upgrade/run.php"; ?>
+<?php require_once "system/upgrade/run.php"; ?>
+<?php 
+if (file_exists('install.php')) {
+    unlink('install.php');
+}
+?>

system/upgrade/index.php

@@ -1,5 +1,5 @@
 <?php
-
+if (!defined('HTMLY')) die('HTMLy');
 $config_file = 'config/config.ini';
 require 'system/vendor/autoload.php';
 require 'system/htmly.php';

system/upgrade/run.php

@@ -1,5 +1,5 @@
 <?php
-
+if (!defined('HTMLY')) die('HTMLy');
 config('source', 'config/config.ini');
 
 $updater = new Kanti\HubUpdater("danpros/htmly");