It is interesting that I was granted an alternative installation with Mountain Lion (10.8.5), and you were not. The difference is that you do not have any Pages installed, and I had Pages ’09 v4.2 installed, which the App Store then updated to v4.3.
I think that you should give Apple a call and explain your situation. Internally, Apple should be able to verify that Pages ’09 was a previous App Store purchase by you, and then do the right thing — either send you an email pointer to access the latest Pages ’09 download, or send you a DVD containing it. There is recent history of Apple doing this reported by members from this community.
I may still have a 2009 Mac Mini with Mountain Lion without any Pages ’09 installed, that I can test with the App Store when I get home from the weekend away, but would encourage the second paragraph action.