See the release notes for Linux Mint 16:http://www.linuxmint.com/rel_petra_cinnamon.phphttp://www.linuxmint.com/rel_petra_mate.php
The mint4win Windows installer was not able to reliably handle the size of the ISO images. It was therefore removed and isn't available in Linux Mint 16.
mint4win was based on Wubi, the Ubuntu Windows installer. Ubuntu already dropped support for Wubi from its 13.04 release (Linux Mint 15's package base). So as it's no longer maintained by Ubuntu for the past two releases, it was bound to creak and break and some point...
If you're not ready to commit to do a real installation of Linux Mint, you can always use VirtualBox to run a virtual machine inside Windows and install Linux Mint to that. VirtualBox is free and generally very easy to use.