A family of Microsoft word processing software products for creating web, email, and print documents.
There were 4 updates to Mac Office in August but you haven't specified which one you currently have. That one may be the problem.
However, note that on the page Dave provided the link to there is a September update. IMO you would do better to install that rather than reverting to an earlier release. It should be necessary to simply use Help> Check for Updates in the main menu of either Office program.Also, your cited version of Sequoia is behind as well. Version 15.7.9 is the current release.