Voilà ce que j'ai trouvé :
Q: Blade and soul error reading setup initialization file
A: re-download, try from mirror. In your BnS install directory, if there are any files that have appended names (for instance, setup (1).exe) fix it by removing the " (1)" from those files and try again. Post a screenshot of your files as well.
If you can't access the website right now, you can directly download the client here
http://download.bladeandsoul.com/BnS_Lite_Installer.exe