Upgrade from Home Office 365 to Office Pro 2016

I find that I have a need to upgrade from my Home Office 365 installation to a version of Office with Power Pivot in Excel 2016.

My current version of Office on the machine is 2016.

Will I have to un-install the existing office installation and download a completely new version or will this change install the necessary additional files on the PC.

I will need to create a new ID for this... can you please let me know the steps required ?