Another way could be with version 8 (I am not sure how it works in a restricted environment) to zip the plugin then rename the zip extension to rbz and install the plugin from Window > Preferences > Extensions with the button at the bottom.
Install Quicktime.
Then visit: http://www.go-2-school.com/podcasts
Some great tutorials here.
After watching each movie simply right click on the movie window and select "Save as quicktime movie".
You can then build up a whole collection that you can burn to disc and watch at your leisure.
