unzip it then manually put it in your folder. If all else fails, do what others have done. There are links to my folder and my maphack folder. Download those and just unzip the d2 rar into your folder and overwrite everything in there. Quite a few have done that and it worked for them. D2loader is in my folder. The links are in the information section.
The power of Diablo ll gets stronger as time goes on! It keeps pulling you back!