ArcGIS 10.2: Desktop Background Geoprocessing (64 bit)

I've installed ArcGIS 10.2 and realised ArcGIS 10.2 still requires a separate installation of Desktop Background Geoprocessing (64 bit) but I've not been able to find a 10.2 installation of "Desktop Background Geoprocessing (64 bit). Please can someone point me to a location from which to download the following?

Regards