Is my Office 2016 / Office 2019 up to date?
Even if you've tried updating Microsoft Word, you may not be running the latest version required for PerfectIt. To find out your exact version number, open Word. Then:
click “File”
click “Account”
A screen will show with the exact version number. It should be of the form "XX.XX (XXXXXXX)". This is the screen in the Mac version.