A family of Microsoft word processing software products for creating web, email, and print documents.
Hi Mona,
If you want to roll back to the previous version, you need to uninstall the currently installed Office for Mac version, and then reinstall Office 365 for Mac client with the old version but for now, the early version only available 16.27 packages. To uninstall Office completely, please refer to Uninstall Office 2016 for Mac.
Let us know if you need further assistance.
Best Regards,
Waqas Muhammad