Where to find older versions of iTunes? Where can I find a version of iTunes older than 12.7 for Mac or Windows?

I have both a Windows 10 PC and a MacBook Pro running macOS Mojave.
The download links for some of the older versions of iTunes are available here: 

https://support.apple.com/downloads/itunes

iTunes 12.6.2 for macOS, iTunes 12.4.3 for Windows 64-bit are the latest under 12.7 listed.