So where is AutoCAD 2014 in the Product Design Suite 2014? The answer is actually noted in this older post:
Just an FYI, the AutoCAD 2014 shortcut is still an shortcut item AutoCAD Mechanical 2014's start menu.
By using the default Suite installer, you are actually saving drive space because you are not installing AutoCAD 2014 again.
Just a note, you can still indeed download AutoCAD 2014 from the Subscription Center if necessary and it is noted in the Installation wizard.