Zencart downloadable products

zencart allows adding downloadable products for sale
where people can buy direct on your website and get the donload after paypal payment
setup takes about 3 hour to get the hang of
e.g.
http://www.youtube.com/watch?v=JQfeu5Rbhvo
http://www.youtube.com/watch?v=ekX-UrzkpoU
http://zencart-ecommerce-website-design.com/index.php?main_page=page&id=13

http://www.google.com.au/#hl=en&source=hp&biw=1276&bih=546&q=zen+cart+downloadable+products