Apple “Older Software” page… ah yes, I have previous references where I simply mention that by name, but that was nearly 10 years ago by now. Surely, a commercial company like Apple could not be that reliable with supporting their older technology, now could they? Indeed, they are not. The original page is off the face of the Internet. Luckily, a quick web search does yield live archived copies on other sites.
20190117/DuckDuckGo apple older software
20190117/https://www.macintoshrepository.org/6877-apple-older-software-downloads-archive
The Gryphel Project also has some saved copies, but not nearly as many, and it does mention the original URL. You can find the archived page in the Internet Archive Wayback Machine.
20190117/https://www.gryphel.com/c/sw/system/index.html
broken/http://www.info.apple.com/support/oldersoftwarelist.html
20190117/https://web.archive.org/web/20080515225712/http://www.info.apple.com/support/oldersoftwarelist.html