Same issue here Doc. I did contact the Mac App Store support via email. Sent them the following -
I reinstalled Snow Leopard on one of my 27 inch iMacs and was in the process of reloading my purchases from the App Store when I discovered that I can no longer install Pages or Keynote. This is apparently due to recent updates that require 10.7.4 or greater. While that's great that Apple keeps updating these apps for free for newer systems, I need to be able to reload the previous versions that run on my OS.
I paid for applications that worked with Snow Leopard, in the case of Pages less than one month ago (July 15, 2012). It is unacceptable that I can no longer access them. I agreed to make a purchase, not a temporary rental that disappears whenever you need to reload your OS due to hardware or software issues. What makes this even worse is that I have a project that I need to complete by this weekend. I fail to understand why the App Store cannot offer me the last compatible version for my OS since it obviously understands which OS version I am running.
The bottom line is that I want the software that I paid for, I don't care if you even have to send me an iWork DVD in the mail. I'm sure Apple got some lying around since they were pulled from the shelves of your stores. If that is not possible, then I would like my App Store account credited for a full refund for Pages and Keynote.
The agent who processed my request either did not read my message completely or completely fails to understand our issue as I was simply told to see http://support.apple.com/kb/HT4482 and http://support.apple.com/kb/TS3624. These documents have nothing to do with the matter at hand. Ugh, trying to escalate the issue.