Platform requires the Adobe Shockwave plugin to run. It’s a free, perfectly safe addition to your browser from the same people who make “Flash” and “Photoshop”.
If you can see the moving text to the right of these instructions you already have Shockwave and can ignore the instructions below.
If you can't see the text you have a couple of options. Many modern browsers will guide you through the install process if you click on the yellow bar displayed at the top of this page. Alternatively, you can click on the button below to be taken directly to Adobe’s Shockwave download page. If you choose to install Shockwave that way, you will need to hit back on your browser to return to this page.