You need Diablo II classic(no LoD) installed. Replace the files in your Diablo folder with the files in the DiabloPatch1.00 folder.
The crack only allows to play without a CD. The original game.exe is included, just in case you rather have slow loading times and trouble having Diablo work with a CD or disk image.
I didn't crack it myself. It's just that people ask for v1.00, I thoroughly enjoy having and playing it and I can't find the upload I got it from, so I uploaded it with more recognisable name and tags