Do not download ZiPhone from any random website. If you share what device and iOS version you actually have, I can point you to safer, up-to-date resources.
ZiPhone is obsolete software from 2008-2009. It is not compatible with any modern iPhone (iPhone 4 or newer) or any version of iOS beyond 3.1.3. Attempting to use this on modern hardware will fail. Use this guide only for vintage devices. download ziphone for windows