Quick Help with Opencart 3

I have moved my opencart website from PLESK hosting to CPANEL hosting, now when I visit homepage it is downloading file called download with the below codes in that file, I need someone to urgently fix this issue now?

<?php
// Version
define('VERSION', '3.0.3.7');

// Configuration
if (is_file('config.php')) {
require_once('config.php');
}

// Install
if (!defined('DIR_APPLICATION')) {
header('Location: install/index.php');
exit;
}

// Startup
require_once(DIR_SYSTEM . 'startup.php');

start('catalog');