CodeCanyon - DOCman PayPal Paid Downloads v3.2.1
We’ve released the most advanced and yet flexible component for selling files with DOCman and Joomla and we’re happy to share it with the Joomla! Community. This component will help you sell downloads / have Pay Per Download on your site. You don’t need to do anything else, just install the component and start earning money. Stop loosing customers because of third party applications that your users has to fight with, with our component there is no need for registration or providing sensitive information.
DEMO:
http://codecanyon.net/item/docman-paypal-paid-downloads-321/137241