Install via composer:
$ composer require hummerk2/convarnish:^4.0
Enable module in your application.config.php
<?php
$config = [
'modules' => [
'ConLayout',
'ConVarnish', // <---
'Application',
'...'
]
];
Copy convarnish/config/con-varnish.config.php.dist
to
config/autoload/con-varnish.global.php