The 2012 installer often fails to detect 64-bit VC++ runtimes. Download and install manually:
CADPower 2012 working on a 64-bit system, you primarily need to ensure that its host platform (AutoCAD 2012 or BricsCAD) is correctly configured for 64-bit architecture. While newer versions of cadpower 2012 64bit work
Tools for quality assurance and cleaning up geometry. The 2012 installer often fails to detect 64-bit
Solved: Installer Files - AutoCAD 2012 x64bit - Forums, Autodesk cadpower 2012 64bit work