Looking at the Internet Archive (archive.org) it appears that the links on the page had been removed as early as August 2013. I have emailed Tim Cook about this and I would encourage all others who can to do the same. If he receives enough emails about this issue then he may put the page back up.

In addition, the Apple Older software downloads page at www.info.apple.com/support/oldersoftwarelist.html seems to have been removed completely. As far as I can remember this page was identical to the other one. I think it has been removed fairly recently as it is still indexed on Google.