Maybe i missed something but i remembre that change log for VA 1.7.3 / 1.7.4 / ... till 1.7.11 i think was
in this page http://www.voiceattack.com/changesbeta
are these versions still relevant?
Those versions don't exist yet, as Gangrel mentioned.
The recent releases went something like this: from v1.7 stable, to v184.108.40.206 beta up to v220.127.116.11 beta, to v1.7.1 stable, to v1.7.2 stable, and now to v18.104.22.168 beta.
So v1.7.3 will likely be the next stable release, once the beta branch is deemed ready for prime-time.
Changes from beta versions, if they're retained, are merged into the changelog for the stable version that contains them.