Here's the kmz file. It might open in Google Earth if you left-click it, otherwise right-click it (Ctrl-click on a Mac) to download it and save it to your hard drive and open it from there.
If you have a newer version of Google Earth, you might notice annoying new "features" such as pausing at points along the tour even when you've set your preferences not to do that. Google becomes a little more like Microsoft every day.
If this is your first time or you're having trouble, click here for instructions.