First Download E-Collidex gaming library
Now Extract it in your desktop(MAYBE IN A FOLDER)
then RIGHT CLICK E-COLLIDEX then go to COMPATIBILITY tab
check the "Run this program as an administrator,so you wont need to right click and run as admin.)
Now Temporarily turn off your Anti-Virus
Open E-Collidex then get the session key:
Then go to E-collidex gaming library click OPTIONS then click "eCollidex Linker"
Then Click "Yes" enter the code and press "OK"
Then go to "Games" then click "Online Games" and then "Grand Chase" then "Grand Chase Tools GX" After that open grand chase and log-in
ENJOY~!