I would suggest that you just download
IZarc and use it instead of Winzip. It's completely free and is generally better. So if you can do that, let me show you what the next steps would be.
Download the patch.zip, and save it to your PlaneShift directory. Mine for example is
D:\Games\PlaneShift Crystal Blue, but the default (if you don't change it during installation) is
C:\Program Files\PlaneShift Crystal Blue. So here's the downloaded patch:

Right-click on it, and choose the following:

You will get a prompt asking if you want to overwrite your older files, and make sure that you overwrite them all:

IZarc will show you progress of the file transfer:

And after it is finished, just run the game updater:

You should be all set and ready to go :]