Hi @Nwambé SIAKE,
What version of Office did you use?
For Office 2016, the available versions are: Office 2016 Professional Plus (available via volume licensing only) and Excel 2016 standalone.
You can get the information from this link: https://support.microsoft.com/en-us/office/where-is-power-pivot-aa64e217-4b6e-410b-8337-20b87e1c2a4b
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