OneNote Gem Add-Ins

Where is the office 365 installed?

Office 365 is a Click-to-Run Office version.

The Office 365 default installed folder is
C:Program FilesMicrosoft Office 15 ootoffice15
And Gem for OneNote provide a feature to quickly to open the Office 365 installed folder.
Picture
 
Click "Gem" tab -> "Folders" menu -> "OneNote.exe Folder" command, it will quickly open the OneNote.exe folder.
 
Picture
 

Download Gem for OneNote