broken sword 3 no cd patch

[dees]

I could really do with some advice. I have found the no cd patch for broken sword 3 on game copy world but what on earth do i do with it? it says replace the bs3pc.exe with the one from the archive file - but it doesnt tell me where to get the one from the archive file?? and its all greyed out anyway.
Please help me .
Dees