Then that's the extent that I know. Perhaps @Gleeok knows more.
EDIT: I found the file in my own ZC 2.5 folder... I'm going to attach it to this post. I run the program on XP, but as far as I know there's no difference between the Windows versions of ZC.
Download the file and unzip it into the folder that you placed ZC 2.5 in, then try using the launcher again.