This item has been identified as an outstanding known issue. A workaround is provided until the issue is officially fixed.
Issue
For versions 1.6 and 1.7 of the PowerPoint Add-in elevated privileges are required to install the add-in through command line and for the "all users" option.
Workaround
Example:
Msiexec.exe /i “<path to msi installer>” /qr
If this workaround is not suitable in your use case, please contact Support at support@anaplan.com.
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Internal Reference: PPTX-308