At the moment plugin is ready to production. Just contact us to firstname.lastname@example.org and we will discuss the best recommendation solution for your bussines.
We can provide installation for you. But if your dev team want to test plugin just write to us and we can send trial access token to repository.
update composer.json with private repository and access token
composer require kuzmany/mautic-recommender-bundle
php app/console mautic:plugins:reload
php app/console doctrine:schema:update --force
Then go to to plugins and enable Recommender. You should see Recommender in menu