We use Google Analytics here because it is a great tool to help us understand our visitors. Today we’re going to talk about a way to track if visitors download files or click on links to external websites. Tracking this sort of behaviour may be really important to see if people are interacting with the web site the way intended. For example, businesses that have their brochures or product catalogues downloadable as PDF’s. The official Google Analytics help says that any link can be monitored if this script is added in the link: onclick=”pageTracker._trackPageview(‘/file_name.file_extension’). Adding this script to every download link on your website can be a laborious task.
read whole artcile on Good Web Practices | http://www.goodwebpractices.com/roi/track-downloads-in-google-analytics-automatically.html