Windows installation instructions
There may be a number of reasons why, if you have had the Cite While You Write (CWYW) add-in showing in Word previously, it may have dropped off. Below are solutions for both Mac and Windows devices:
Windows
To reinstate the EndNote tab in Word on Windows devices, please follow the instructions below in the first instance:
Mac
To re-instate EndNote X8 in Word on Macs, please see the link below.
https://support.clarivate.com/Endnote/s/article/EndNote-X8-Mac-and-EndNote-online-Mac-CWYW-tools-in-Microsoft-Word-2016-Troubleshooting-guide?language=en_US
If this solution does not fix the issue, please refer https://support.clarivate.com/Endnote/s/?language=en_US