There are reports that the SSAS archive out on http://www.microsoft.com/downloads/details.aspx?displaylang=en&FamilyID=868662dc-187a-4a85-b611-b7df7dc909fc is corrupt….”damaged, truncated, or has been changed”, to exact 
To open it, simply rename the cube zip file to Contoso_Retail.zip and then try again – happy OLAP-ing.
