HiddenLevers maintains an archive of videos and slidesets for each War Room that can be accessed from your account, click here to visit the archive or follow the steps below:
Log in to your HiddenLevers account.
From the main menu at the top right of your screen, under "Scenarios", click on "War Room Webinars" in the drop-down menu:
This will take you to the archive, simply scroll through the webinars listed or use the two drop-down menus in the top-right of the screen to choose a time period or topic and limit the number of webinars displayed:
Once you see the webinar you want simply click on the picture to start the video for that instance. In the bottom of the window will be a link for the Powerpoint slides from the webinar: