You can uninstall maplestory first then redownload it
Go to the mail nexon sent you and find the option to delete
GameLauncher.exe
Yes, you just look for where you saved it, then click Game Launcher
Go on to delete
how to delete a file using keyboard
You go to Nexon.net and customer service to deactivate your account.
Navigate to the file and click the Delete File link
You can delete it by going into Windows Explorer, finding the file, right clicking it, and clicking delete.
To delete a file in Hamsterz Life, navigate to the main menu and select the "File" option. From there, choose the file you wish to delete and look for the delete option, which is often represented by a trash can icon or a "Delete" button. Confirm the deletion when prompted to permanently remove the file from your game. Always ensure you want to delete the file, as this action is usually irreversible.
that'll depend, what glitch? o heres one, delete maplestory and try to start it up, it wont work cool glitch huh?
Just right click on the file and click "Delete File(s)" UPDATE: IF IT WONT DELETE YOUR SCREWED!
go on explore and find the file that says "nexon" and go in. there is a file that's says maplestory there right click and choose uninstal it shoud take a couple of seconds good luck!!!