I have been asked by a few others who also have TechNet that they were expecting a single download for all the Windows 7 versions.  The question as asked “ If Microsoft is selling the Retail DVD of all versions on 1 DVD, why is it split up on TechNet to a download per version? Is it possible to make it an All-In-One again?”

     well here is the answer:

If you Open the ISO and browse to the Sources folder and remove ei.cfg and then burn the ISO. That will allow you to choose the version you want installed.