For all the people who cannot get this to run. The first thing you need to realize is what kind of computer you have, and what version. (Windows Vista, Mac, Windows XP). Some versions may react differently to hacks, since they are Third-Party programs, and "technically" a virus. I say technically, because they aren't the kind that will harm your computer.
This hack is fairly straight forward on how to use it. I will give you a run down of how I use it. (Windows Vista Home Premium).
I first click on GChaxSD. Depending on you if you are running vista or not, you may need to RIGHT CLICK on the hack, and select "Run as Administrator". After you have selected that, or just double clicked the hack, let it open. Click on the "Set Timer Below" box, and select the time you want. (80 seconds is about right for me). After checking the box, click "Browse". The next thing you need to do, is locate were your Grand Chase folder is. If you have any common sence about your computer then this step should be easy, if not then follow along. You should now see a whole bunch of files after clicking "Browse". If you see the file "My computer" click that. It should now drop down, and give you different selections. Click your HARD DRIVE, (For me, this would be 'C'). After clicking on C, simply scroll down until you see the folder "NTREEV". Click on NTREEV, and it should come up with all the files for Grand Chase. All you do from here is click on the "Grand Chase" file. DO NOT OPEN IT. Simply click on it, so it is highlighted, then select ok. After this is done, you should now have your Timer set, and the location of your Grand Chase file. For this new hack, you can select Bypass Patcher. (I did, and the hack still worked) When all of this is done, press "Activate Hack + Run" After this is done, a message box should pop up giving you a warning by "Makim" Wait until everything is loaded, and you see the title screen with a loading bar, and all the bosses. After you have gotten to the log in screen, hopefully your count down clock is still going. Just wait at the log in screen until it hits ZERO. Another box should pop up, giving you a confirmation. Before you log in, press "Activate this After Logging in" It should be the only button left you haven't clicked on yet. After you have logged in, press this button, and the final message should pop up telling you everything is good to go. If you did not receive this message, try again. If so, then happy hacking.
The other problem you could try, is de-activating your Anti-Virus. I don't recomend this unless you know the file you have is safe. So, scan it if you can. For this file, it should be safe. I've scaned it with Malware, and AVG.
Another fix, could be to right click on the hack, and go to "Compatibility" and choose an older version to run the hack.
If by now you cannot run the hacks, you did something wrong. They should work, and they did for me, and plenty of other users.
I hope this helped, and will stop with all the people asking if it works, and why it won't work.
EDIT: This was pre-patch. I haven't tested them after the patch. If they work after the patch, I will update this post, and let everyone know.