Note the pattern in the version names on the site (though not 100% consistent). That said, 7.4.2 does not appear to be available. Sometimes they omit certain versions for reasons best known to Apple, but maybe there were imperfections. 🙂
Apple does not allow people to post links to other sources for versions not available on the Apple site. 'Nuff said. 😉
your my hero, i spent ages on apple.com looking for the previous versions, but could never find them. anyhoo thanks for helping me greatly, really thankful i can continue with organising my life.