Here is a URL for a lot of the Excel data mining add ins: http://www.microsoft.com/en-us/download/details.aspx?id=29061
So I can find the add in for Excel 2007 against SQL Server 2008 SP2, as well as the add-in for Excel 2010 against SQL Server 2012 -- and a lot of other combinations.
What I cannot seem to find though is the Excel 2010 add-in for SQL Server 2008 R2. Any tips appreciated. Thanks.