The Zen Cart installer has been reworked and given a facelift in the upcoming Zen Cart 1.6 release.
I’m really looking forward to the new version – it also boasts a new modern, responsive default template and guest checkout built-in! You can read more about the development roadmap here: http://www.zen-cart.com/showthread.php?199322-Roadmap-for-v1-5-and-beyond
In the meantime, check out these videos showing the new installer in action – both for a new install and a version upgrade.
New install of Zen Cart
Upgrade existing installation of Zen Cart