After upgrading the "Accelerator: Program Management Office" add-in, the Content Add-Ins page still shows that it is "Upgrade Pending".
Force reinstall the PMO Add-in.
Important: Back up both your Clarity home folder and database before proceeding. When using force option all PMO configurations are reset to default and customizations are reverted.
After re-installing, the status should now be "Installed" or "Upgrade Ready".