I too have trouble seeing things here, I first see a page briefly, then it switches and becomes a blank black page with an X to close it and both a left and right scroll arrow, that are dimmed out. I am using Safari as a browser.  I was finally able to quickly click on the download link button before it switched to the black presentation page. There were about five pages of info in a slide show style. Maybe this plug in is what is not working correctly. The page that described 12.2.4 changes, only said general improvements.