It doesn't happen often, like once a day (at random times) but reinstalling it every time is getting annoying. Screenshot of what's left in the folder: Spoiler: Screenshot It might be similar to this issue https://royals.ms/forum/threads/mapleroyals-exe-getting-deleted.79880/ but unlike the OP of that thread, I've no way to record a video because I have no idea when it's going to happen. I also don't have any antivirus/defender enabled. The client also crashes occasionally but I guess that's normal.
Reinstall and add your MapleRoyals folder to the exceptions list in your antivirus. Most likely Windows Defender js quarantining it.
Then you have a gremlin in your computer. This happened to me a few times until I added the folder to the exceptions list. And if you have Windows 8 or newer, you have Windows Defender installed, ergo you have an antivirus installed.