No "Plugins" under the "Window" menu

Hi guys,

I’m trying to setup my Unreal Engine to work with my Samsung Gear VR but I’m having a problem while following the Samsung Gear VR UE4 Quick Start tutorial and the Up and Running with Gear VR video tutorial but I see no “plugin” under the Window dropdown menu and so I can’t access the “Head Mounted Displays” section. I tried accessing it under the Edit->Plugins but I see no “Head Mounted Displays” under the Built-In menu. I’m having the same problem both with the U4.11.2 and the U4.10.4 versions. Thanks, as usual, for your help!

How did you install the plugin ?