Put the version of oggdec.exe from that archive into the Kivan/ogg folder (overwrite the existing oggdec) and reinstall the mod. Don't let BWS do it or it'll probably just overwrite it again with the funky version (though there should be some way to disable that in the BWFixpack or whatever it is that does the overwriting). Once the mod is installed though, it should be safe to resume BWS.
Good news everyone!
The installation worked (almost flawlessly, but no biggy).
I pasted the oggdec.exe file in the folder once setup was completed, right after I've configured the install, at the beginning of installation.
Only little bumps:
- Faren's issue regarding the absence of the Chloe mod did a comeback. (Chloe component of Faren not installed due to error: just annoying timewise because it halts installation.)
- Dark Horizon was not installed, but that's my own fault: chose a Standard install and forgot to modify the install.bat accordingly for Dark Horizon (tactical mod). :S
I'm about to run the game now to make sure everything is ok.
Thanks for your help everyone, and again a special nod to Leo for giving us this awesome tool!