Thought the capital 'C' might have been the cause, but it's not. Looks like its broken; I'll be sure to email the admin.
Quote:
http://www.bright-shadows.net/challenges/levelcr4/crackit4.exe
http://www.bright-shadows.net/challenges/levelcr3/Crackit3.exe
http://www.bright-shadows.net/challenges/levelcr2/crackit2.exe