The last iTunes version for Windows is 12. Are you unable to install it on your Windows version?

Edit: I know iTunes for Windows is not quite as good as the Mac version (possibly an understatement.) There were also changes during the versions I did not particularly like. But if you would prefer an older version then possibly https://itunes.en.uptodown.com/windows/versions
It appears both oldversion.com (HTTP ERROR 503) and oldapps.com are no longer. At least I cannot seem to access the sites.

Two links that reference older app sites: https://techdator.net/best-sites-to-...s-of-software/

https://www.thewindowsclub.com/downl...rsion-software
That sounds about right. Typical Apple way of doing things.