I was trying to upgrade my Visual Studio 2012 to allow editing Business Intelligence projects by installing SQL Server Data Tools (thread on that topic), so I downloaded this installer for the SQL Server Data Tools and chose an existing SQL Server 2012 instance to install to, then I got this error 'Rule "Same architecture installation" failed.'
After some searching it appears that you need to choose to perform a "new installation".
Here are the links where I found this information:
http://social.msdn.microsoft.com/Forums/sqlserver/en-US/4ae33edc-c1ad-44df-bc74-ffb30ea91287/64-bit-microsoft-sql-server-data-tools-business-intelligence-for-visual-studio-2012-?forum=sqlreportingservices
http://blogs.msdn.com/b/jenss/archive/2013/03/07/finally-the-family-united-sql-server-bi-project-templates-now-available-in-visual-studio-2012.aspx
