It suddenly happened today, i tried to log in, the .exe threw me an error "Windows cannot find 'C:\users\etc etc\mapleroyals.exe'. Make sure you typed the name correctly and then try again" and then it proceeds to magically disappear. That's it, nothing else to say, i've tried to reinstall, redownload and all, i have no idea wtf is going on.
Your virus scanner is 'protecting' you from a trojan horse which is the mapleroyals.exe file. Check your virus scanner and exclude this file from being scanned. If you don't know how to do that; Google is your friend.
If you're using Avast, like I am, excluding the files via Program Files (86x) didn't work for me so I dragged it out to the desktop and added the new placed file in the excluded list and it worked. Good luck.