Word, try to check References menu, whether the Mendeley Cite-O-Matic menu already exists.
Or you can search on C:Program Files (x86)Mendeley DesktopwordPlugin To download, select the appropriate version for your device: Mendeley for Windows. Mendeley Desktop is available for Windows, Mac OS X, Linux and iOS devices.
Download the latest version of Mendeley from the Mendeley site (if you haven’t it) Mendeley Desktop is the downloadable version of the Mendeley software, and is used in conjunction with Microsoft Word.
In the menu of Windows Explorer, click View -> Options -> Change folder and search options -> select the View tab -> Hidden files and folders -> select Show hidden files, folders, and drives). Before starting, we need to display hidden files and folders in settings.
