For these steps to work, you MUST be on a page that is trying to use Flash Player.
Click Manage add-ons.
Make sure Toolbars and Extensions is selected for Add-on Types. Select Shockwave Flash Object. (Note: Shockwave Flash Object will not appear if the page you are on does not have Flash Player content.)
Click the Enable button. Click Close to close the window. If your video or lecture still is not playing, please refresh the page.