You could just download the client from blizzard, although I forgot what the links were too it.  Or you can just torrent it. 
Could also check these out, don't know how old they are though
http://darkblizz.org/Forum2/sc2-tools/sc2-map-editor-crack/
http://sc2.nibbits.com/assets/starcrack-allin1/
http://www.battle4sc2.com/

Also the crack doesn't allow you to play multiplayer online on blizzard servers, you would still need a cdkey for that.