Audio files for individual lectures can be downloaded from the course schedule page
It is also possible to subscribe to these lectures as a podcast from a software such as iTunes.
iTunes is available for free from apple.com for Windows and Mac.
For podcasts clients for other platforms such as Linux,
see here
Or try Juice, an open-source
cross-platform podcast client.
To subscribe, go to the Advanced menu tab in iTunes, and click on "subscribe to podcast" option. Then, enter the following URL: http://lass.cs.umass.edu/~shenoy/courses/377/podcast.rss