legacy versions of apple software and the mysterious appldnld.m7z.net site

This has been bugging me for a while now. the other day i finally updated to itunes 9 and lo and behold it refused to start so i went looking for itunes 4.8 which i had before the update. it seems that all traces of legacy versions of apple software vanish off the face of the internet shortly after they are posted. so i asked on a forum and was given a long link to an apple server with the address appldnld.m7z.net/content.info.apple.com/insert file info here" and lo and behold i was able to find the dmg file for itunes 4.8. i did some digging and from what i have been able to find out this mysterious server seems to retain all versions of apple software past and present and yet remains unsearchable and un connectable unless someone gives you a direct link to the file. so my question is where do people get these links and why does apple make it so god ****** hard to find legacy versions of their software when they have an entire server full of them available to anyone who manages to acquire the full url