Open simple modal when user clicks download button.

I would like to be able to open a simple modal when user clicks to download that shows all of my social icons and prompt the user to follow me similar to Pixelden.com

If you click this link and click the download button you’ll get the idea.
http://www.pixeden.com/social-icons/dark-social-icons-set

This would be awesome!!!
Thanks in advance

https://wordpress.org/plugins/delightful-downloads/