For all of you people having problems updating the HackShield, this is a very simple fix.
1- Navigate to your game's directory.
2- Open HShield folder.
3- Right click on HSUpdate.exe and go to Compatibility tab and tick "Run this program in compatibility mode for Windows XP Service Pack 3".
4- Tick run as administrator.
5- Launch HSUpdate.exe (Not Knight Online Launcher).
I hope this fixes the game for you, feedback would be nice.
If you still have problems it would help to add HSUpdate.exe to firewall exception list.