
Update to the latest version (Windows: Help > Check for Updates / Mac: EndNote > Check for Updates). If you haven't installed EndNote X8, X9 or EndNote 20. After you have installed Office 2019 follow either of these two paths: Make sure you also have the latest patches and updates.

Login to your Office 365 account and download the Office 2019 (or lower version) and install it. This subscription allows you to download MS Office 2019 or MS Word 2019 (or lower version). Office 365 is a subscription plan for the cloud/Online application. Yes, EndNote X8, X9 and EndNote 20 Cite While You Write (CWYW) both are compatible with Office 365 or MS Word 365.

Please also see EndNote Windows or Mac, Cite While You Write CWYW tools missing or disabled in MS Word.
