How's it going, Joe?
EDIT: Thanks to the crack by PAKHAN, the game runs fine without CD now. There is just one problem:
The desktop shortcut had to be changed to point Jack.exe instead of Launcher.exe. The Launcher.exe still remains uncracked!
BTW, the installation instructions are all messed up! One does NOT need to copy anything from CD. All that one needs to do is to extract the Jack.exe file from the archive into the gamedir after installing the game.