Silent install of latest Adobe reader

I'm trying extract the msi to do a silent install of the latest Reader.  I've downloaded:

AcroRdrDCx642300120143_MUI.exe

AcroRdrDCx642300620360_MUI.exe

But when do the extraction (either with 7zip or the command line switches) I end up with AcroPro.msi instead of AcroRead.msi.

What am I doing wrong?

Has there been a change to the system that I need to know about?