Since filenames are restricted in RMMV (you can't just name a plugin whatever and run it, it won't run if you don't name the file EXACTLY what is specified in the plugin, etc), it is recommended that you download the plugin from my website.

Get it here:
http://mjshi.weebly.com/mv-non-combat-menu.html

Direct link (skip looking at pretty screens):
https://www.dropbox.com/s/mis7c4yj18uzb5r/NonCombatMenu.js?dl=1

Forum link:
http://forums.rpgmakerweb.com/index.php?/topic/56344-non-combat-menu/