All components of AX for Retail 2012 now get installed via the unified AX installer. One of the nice things about this installer is the built-in Prerequisites Validation checker that it has.
However, there is one missing prerequisite for the Store Connect installer; you may get the following error when you launch the setup utility:
“The program can’t start because mfc100u.dll is missing from your computer. Try reinstalling the program to fix this problem.”
The Retail Store Connect Settings utility requires the Visual Studio C++ runtime to be installed. You can grab it here:
Once you have that installed you should be able to launch the utility and configure your Store Connect instance.