If u still face this problem even after changing the new .exe file, try starting with the .exe in the program files instead of the one on desktop. Personally i had this problem cause after replacing the file, my desktop shortcut's links were messed up. Then fix ur desktop shortcut accordingly. Hope i can help most of u guys.
If you still cannot get on here are some easy steps on how to do this 1) Permanently delete all the files of MapleRoyal you have 2) re-install after done so. 3)when its done download the new client 4) open the inner file of the mapleroyal file which contains all the wz patches etc 5) copy the .EXE file 6) paste it into file with all the wz stuff 7) Click over right (this over rights the original mapleroyal folder) 8 Make sure the .EXE client file has the same name as the original mapleroyal file 9) now you can play this worked for me