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The installer shouldn't cause that kind of warning since it only sends HTTP(S)-Requests which is exactly your browser does. It doesn't behave exactly like a browser and you could detect it by scanning your internet traffic but I don't know why your friend's ISP would call it "abnormal behaviour". Most likely they detected traffic to known C&C servers or ports commonly used by trojans. If that's the case, the warning is warrented and you should make sure that your friend's computer(s) aren't infected.