pwallner

This WooCommerce plugin prevents a user from being able to purchase a downloadable product that they already own. In place of the “Add to Basket” button on the product page, a message will display informing the user they already own the item, and links to download the linked files are provided there. Those links are the special links to the file that are provided on the “My Downloads” page, or part of the “My Account” page.
If the user has had a refund for the item the normal “Add to Basket” button will show again, allowing purchase.
On any page that displays the products other than the single product page, the button shows as “Read More”, as though the product is not available.
The plugin is very fast, works together with WPML and can show the output in any language!
Now it also works with WooCommerce Subscriptions!

Disable Downloadable Repeat Purchase – WooCommerce + WPML

For WooCommerce. Disable the ability for logged in users to purchase items they already own that are downloadable.

jondor

A shortcode which shows an gallery of downloadable images. The basic idea was to have an easy way to make some images available for download. 
For a working demo see: http://plugins.funsite.eu/downloadable-gallerie/
<h4>shortcode</h4>
<pre><code>[downloadable_images taxonomy="gallery" slug="wallpaper"]
</code></pre>
The default for taxonomy is gallery, the default slug is “wallpaper”. So the above could also be used as
<pre><code>[downloadable_images]
</code></pre>
I use this plugin together with “Enhanced Media Library” (https://wordpress.org/plugins/enhanced-media-library/) which enables a taxonomy on the 
media library (besides other features)
This plugin implements a custom thumbnail size of 300px width so probably you will have to regenerate thumbnails too. As a minimum for the 
photo’s shown if they are already uploaded. New uploaded photo’s will generate this thumbnail automatically.

downloadable gallery

A shortcode which shows an gallery of downloadeble images

Disable Downloadable Repeat Purchase – WooCommerce + WPML vs downloadable gallery