Download free products and also add them to the cart

Good day,
i’m building up an e-commerce only for request quotes and i’d like to provide datasheet’s product free for logged in users. I downloaded Free Downloads WooCommerce plugin, set all prices to 0, and allow logged in useres to download free product.
That’s work, but have to allow the users to add free products to quote and i can’t with this plugin, how can i solve this?