[rnln]

winzip is a name of a program to zip your file\s. What is zip the file. It is making the file\s to be smaller in size for transferring it from one place to another.

Not sure about "you need to purchase winzip" but probably they used to zip the app you downloading and telling you that you need winzip to unzip it.
I am not sure about these much anymore, but I think you can search around to download winzip for free, or maybe try 7-zip. Someone uptodate probably could tell you if 7-zip can open winzip or not , I can't remember but I don't think it's hurt to try.