ExtendInsights can be installed by end users or by Microsoft 365 admins.
End Users
Option 1. Click here to install from Microsoft AppSource
Option 2. Install form Microsoft AppSource from within Excel
Open Excel and select Add-Ins from the ribbon, search for ExtendInsights.
โSearch for ExtendInsights and click Add.
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Microsoft 365 Admins
Microsoft 365 admins can follow the instructions from Microsoft here to install and deploy to one or more users simultaneously.