All of our shiurim are available for download from this site. If you look at the list of shiurim on our search page, you should see a icon in the last column. If you click this, you can choose to listen to the shiur immediately, or download it for later use. Similarly, the icon allows you to watch the video immediately, or download the video for later use.
Shiurim with an icon, do not have audio and/or video available.