The translators only worked on the English patch, not the crack.
"P.P.S. We ask that you do not include our patch with any illegal versions of the game." - by basicvntls
lol
Edit:
I got it working. You pretty much have to mount an iso of the game to get start.exe to work and use the serial key.
You can get the iso and serial key off the link jakzeam posted.
https://erogegames.com/eroge-visual-novels/eroge-general-talk/3415-koi-senkyo-chocolate-download-link/