Steven

This plugin requires  1.6 or greater.
When using the <a href="https://wordpress.org/extend/plugins/easy-digital-downloads/" rel="ugc">Easy Digital Downloads</a> plugin to sell digital downloads, this plugin will allow you to optionally add a change log and version number to each of your downloads.
What does EDD Changelog do?
It does a few things…
<ul>
<li>It adds a metabox to the download post page that allows you to enter the change log and the current version number.</li>
<li>It’ll automatically append the change log at the end of the download’s product page in a collapsible container. If you do not want to automatically append the change log, there is an option to turn this feature off per download.</li>
<li>It also adds a new shortcode, <code>[edd_changelog]</code>. This shortcode when used on a download page will automatically show the current downloads change log. The shortcode has 4 options, <code>id</code>, <code>toggle</code>, <code>show</code> and <code>hide</code>.</li>
<li>The change log and version will also be inserted in the <code>[edd_receipt]</code> shortcode under the download link. The change log is presented as a link, that when clicked, will show in a lightbox.</li>
</ul>
What about <a href="https://easydigitaldownloads.com/extension/software-licensing/" rel="nofollow ugc">EDD Software Licensing</a>?
This plugin completely compatible. If you’re not yet using <a href="https://easydigitaldownloads.com/extension/software-licensing/" rel="nofollow ugc">EDD Software Licensing</a> and you decide to start, <a href="https://easydigitaldownloads.com/extension/software-licensing/" rel="nofollow ugc">EDD Software Licensing</a> will automagically use the change log and version number you entered using this plugin. If you are using <a href="https://easydigitaldownloads.com/extension/software-licensing/" rel="nofollow ugc">EDD Software Licensing</a> this plugin will avoid redundancy and will use the change log and version entered into it.

EDD Changelog

Great Plugin Keep it Updated

Would be nice the option of adding each version as a separate entry



Great plugin

Add a new metabox to the download where you can input the changelog. The changelog will be appended to the download page and the purchase history.

Dan Griffiths

Adds a robust third-party product system to Easy Digital Downloads. When activated, adds new fields to the Download Prices meta box allowing you to specify redirect details.
External Products is based on the extension of the same name by WebDevStudios.

Easy Digital Downloads – External Products

Was looking for exactly this: an option to add third party plugins on my own EDD shop. 

Perfect

Adds a robust third-party product system to Easy Digital Downloads

EDD Changelog vs Easy Digital Downloads – External Products