I did everything from head to toss from installing format and also the troubleshooting guide before i posted this treat. well ended up is still the old errors every time im trying to open ariesMs.. wz. bad files/disappear while loading in the character choosing... even tried to reinstall the whole exe. too.
thanks.
You need create an new folder and place the Elluel client in that clean folder. Once that is done you need to choose that clean folder you just made to install the MapleStory files, if you do that then you will not run into the bad WZ error.
Note it's important your 'Enable automatic updates' option is disabled under Settings > Game Configure in the Nexon Launcher.
If you need any help you can refer to the installation guide
here or the response by Spyro,
here.