WinZip is a utility to compress files in Windows. Only the illegal copies of this software are available for free. You can download legal evaluation copies for free at WinZip website or some other websites like Download.com.

Here are some links where you can download latest version of WinZip:
http://www.download.com/WinZip/3000-2250_4-10003164.html
http://www.winzip.com/index.htm

WinZip offers 45 days of free evaluation copy. After 45 days, you’ll either have to uninstall software or buy a license to use it.

If you don’t intend to use an illegal copy then there are some alternates like jZip. jZip is a free software which is an option for a WinZip. jZip can perform all tasks that a WinZip does. You can get jZip here: http://www.jzip.com/.