There is an issue with the help files wherein if you link from the S&P user interface it indeed points to an incorrect link. Our Engineering team are aware of this issue and are working to resolve it. In the meantime the following link should work fine to access the Search&Promote Help system..
http://microsite.omniture.com/t2/help/en_US/snp/index.html#
From here you should be able to navigate successfully.