bootstrap.php not found in index.php

Greetings, 
I downloaded a very fine update on the script from : https://github.com/codeigniter4projects/website2

when I put in localhost , I got this message:

PHP Code:

Fatal error: require(): Failed opening required '/Applications/XAMPP/xamppfiles/htdocs/CI/app/Config/../../vendor/codeigniter4/framework/system/bootstrap.php' (include_path='.:/Applications/XAMPP/xamppfiles/lib/php') in /Applications/XAMPP/xamppfiles/htdocs/CI/public/index.php on line 36 


 I wonder how to fix it?

Show us please a directory structure?

AND you must execute in your root folder the next commands:

PHP Code:

composer require codeigniter4/framework

composer update 


Most likely the problem is that you do not have the vendor folder.