Firstly, you should check the website you want to download the application from. Secondly, configure your antivirus to allow downloading of certain files or from certain websites. You can add the website to Exclusions list (Warning: DO THIS ONLY WHEN YOU ARE MOST CERTAIN THE WEBSITE IS REAL).
I have downloaded and installed WinZIP and it's working just fine. There are no problems with the download.
Direct download URL: http://download.winzip.com/gl/winzip19-new.exe