So, the time I've spent trying to get MapleRoyals to run have felt like an eternity. Why are there so many problems with the client? First, all my browsers detect a false positive virus in the client, had to turn off security to successfully download it. Second, I have to download it a number of times until it actually comes out as a real client (not sure if anyone else experienced this) Third, even after successfully downloading a working version of the client, it will eventually delete itself. What, the, hell.
Try, putting your Anti Virus live protecting Service off for the time of downloading and moving to the clients folder, then create an exception in your AntiVir for the MapleRoyals folder. After that you shouldnt be able to reenable your Protection software without it deleting the client.