When is UniZIP done with the unzip process?

I am using uniZIP (http://forum.unity3d.com/threads/unizip-free-zipper-unzipper.220589/#post-1810407) to unzip a large zip file (1.1GB) and I need to know when it's done unzipping. Example code in js, of saving the downloaded file and starting the unzip process:

 File.WriteAllBytes(GameFolder + "\\Temp.zip", bytes);
 ZipUtil.Unzip(GameFolder + "\\Temp.zip", GameFolder);

This works great, but I have no idea when the process is done. Any help would be greatly appreciated.

A simpler solution (with other zip tools) is also acceptable.