While installing SSDT –BI for SQL 2014 (aka SQL Server Data Tools - Business Intelligence for Visual Studio 2013), you might get this error if you have a pre-existing instance of SQL 2014 and you had opted to use the existing instance.
Same architecture installation
When you click on View detailed report, you will find this message:
The CPU architecture of installing feature(s) is different than the instance specified. To continue, add features to this instance with the same architecture.
Apparently this is a bug, because if you go back a couple of dialog windows and select Perform a new installation of SQL Server 2014, it will actually use the existing instance without installing a new one.