Also, do you know whats going wrong with the unzipping?
Maybe try again downloading the mod. I downloaded it yesterday and it works like a charm. One comment though, when Steam prompts to choose the game to run, select Corruption not the Gold Pack. I hope this helps.
Make sure you have proper admin permission to modify files in that folder. This isn't an issue with the mod, it's an issue with what you're doing to extract it or your system, so without seeing what's actually happening I can't really know for sure where you're going wrong.