解决方法：Settings -> Preferences -> Misc -> Enable Notepad++ Auto-Updater 去掉该选项。
链接：http://sourceforge.net/p/notepad-plus/discussion/331754/thread/a1215268
引用：
GUP = Settings -> Preferences -> Misc -> Enable Notepad++ Auto-Updater.
If you disable this, "GUP" will not run, and thus you will not get the 'Elevation' question.