That domain no longer exists. However I found a copy of the .CHM file here:
http://forum.piriform.com/index.php?showtopic=1504
However does the /S flag on the install come with the Yahoo! Toolbar? No offense, but the Yahoo! toolbar is worthless to me. I don't want it on my systems. Sure, you make money on including it, but at least give us an unattended flag to remove it.