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Its near impossible to get banned using the programm. The only reason to get banned is, when you got live exposed by a GM (Wsp you, no reaction, waiting a few minutes - still afk = bann)
So you can using the bot without any risks if you have an eye on your NosTale task. I prefer to put NosTale on a seperate monitor, so I can also play other games (windowed!) or watching videos.
About every 50-100h of botting you may get 1 time overwatched by a GM.