I’m creating a new thread because the other one was becoming really crowded (28 pages) and had a mix of issues for various versions of EndNote.
I installed EndNote X8 on my Mac, ran the customizer, the add-in ended up in /Library/Application Support/Microsoft/Office365/User Content.localized/Startup.localized/Word/EndNote CWYW Word 2016.bundle as expected and was updated to X8, yet the toolbar is not showing up in Word at all on my Mac.
I am having the same issue. Was fine in with previous version but most recent word update seems to have broken this. Interestingly, CWYW from endnote itself still works, just can’t add references or go to endnote from within a word document
But I would never depend on an add-in program like Endnote to necessarily be compatible with insider builds? Hitting a moving target is not good business practice.