Here is the Korean WarRock installer: https://warrock.nefficien*****.kr/warr...RInstaller.exe
With Nexon Plug try uninstalling it completley then reinstall it again:
https://platform.n*****m/NexonPlug/Ins.../NexonPlug.exe
As for the patch make sure you're using this one:
https://www.*********.com/file/ly7f59
And only install the patch when the game has fully installed and make sure you install it to the correct place.