The (otherwise fantastic) auto-install feature can't really be used anymore since git-scm.org does not offer client downloads in zip format anymore. Currently even the portable installers are delivered as 7z.exe => see git-scm.org.
It would be great to be able to auto download, install and use the git client for windows again.
NB: the functionality appears to work great for the cmake build plugin - potentially this code can be reused?
You can find ZIPped binary distribution on github: https://github.com/git-for-windows/git/releases/