Microsoft Office

Which Microsoft word version a .docx file was saved?
Make a copy of the *.docx file and change the extension to *.zip.
Open the zip file.
Open the docPropsapp.xml file.
Look at the end for the AppVersion tag value:
12.0000 = Word 200714.0000 = Word 201015.0000 = Word 201316.0000 = Word 2016

Office 2019
Open cmd as a Administrator
cd C:Program Files\Common Files\microsoft shared\ClickToRun\officec2rclient.exe /update user updatetoversion=16.0.13628.20274
Wait for couple of minutes

Fix tools

Office 365 - Fix Tools

Sara - Fix Tool