The webpage (http://www.cisco.com/pcgi-bin/tablebuild.pl/sdm) given in step 1 of this hands on lab indicates that the page will be retired this month. The SDM sales demo is not longer supported and is not available.

There is an updated/replacement product called the Cisco Configuration Professional for ISR devices available at http://www.cisco.com/en/US/products/ps9422/index.html

If you were looking for SDM for a non-ISR I'm not sure where you would go at this point.