WooCommerce Subscriptions Downloads GPL Overview:

Offer additional downloads to your subscribers, via Downloadable products listed in your store.

WooCommerce Subscription Downloads enable you to offer downloadable products to your subscribers while maintaining individual listings for each of your downloadable products, having them sold individually via your store, as well as via the subscription.

WooCommerce Subscription Downloads adds one new field to your downloadable products, in the Product Data meta box. Once you have your subscription product in place, the subscription can be searched for via the new Subscriptions field shown when adding your Downloadable product.