I don't know how WinZip works, but there is another program to unpack ZIP folders called WinRAR. You can download it for free, and it tells you that you can only use it for 40 day trial, but actually you can use it forever. After installing, right-klick the ZIP folder of the game and unpack it, and in there you find the application.
You have to open the folder with WinRAR or a similar program to unzip files (WinRAR is free to download, even though it states it can only be used for a limited time, you can use it forever). After installing the program. simply open the folder with said program and click on the game inside, or right-click the folder and unpack it with the program and click on the game in the new folder.
