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Overview
The Timeline Add-in does not support PowerPoint for Mac.
Timeline cannot be installed on Mac OS and does not work with PowerPoint for Mac. It can be deployed on a virtual machine using desktop virtualization solutions like Parallels or Bootcamp to run Windows; however, this is not a tested scenario.
Solution
Mac users can use the online version of Timeline by going to https://www.lucensoftware.com/products/timeline-online
See Windows PC System Requirements for the PowerPoint add-in here: https://support.officetimeline.com/system-requirements-for-office-timeline-add-in