I can tell you exactly why the zc_install doesn't launch. It's telling you 404 Not Found. That's why.

The real question you need to find an answer to is ... why is YOUR server not seeing the file that you allege is there?

And what on earth do you mean by "while zc_install is not renamed to english zc_install"? What does "renamed to english" have anything to do with zc_install?