Pivotier Version 1.5 uses the pre-release version of Microsoft's Report Viewer 2012 as this solves several inconsistencies between the remote (i.e. SSRS) viewer and the local (i.e. Windows) viewer.
During the installation of Microsoft's Report Viewer 2012, it requires the installation of Denali CTP3 components. This is usually automatic, but in some cases asks for the separate installation of these components.
Please note that these components are for the Report Viewer 2012 and have nothing to do with your SQL Server version.