SQL 2012 Upgrade Advisor

I just tried to install the SQL 2012 upgrade advisor on my SQL 2008 R 2 box and I got an error telling me that setup is missing prerequisits.  It says that Transact-SQL ScriptDom is missing and that I have to go tohttp://go.microsoft.com/fwlink/?LinkID=216742 to get it.  But, when I go to that url, I get a 404 error.  Where do I get the stuff I need for the upgrade advisor?

Thanks

Bert