No available sources found - Parallel Studio XE 2015 Update 6

I am using Software Manager to install the update. 

At the Options step, expanding

+ Intel C++ Compiler XE 15.0 update 6

tells me there are "No available sources found" for Intel C++ Compiler XE for Intel 64.

Similarly

+ Intel Math Kernel Library 11.2 Update 4

there are "No available sources found" for Intel MKL core libraries for Intel 64

I've read the Install instructions, which say "automatically makes the appropriate selection of binaries, scripts and text

files from the installation archive based on the Intel architecture of the host system"..

This is a 64 bit Intel system, so we need the Intel 64 installation sources. 

Thanks in advance.