In DEVONthink Pro Office I go to the Help menu and click DEVONthink Pro Office Help. The Help window opens, but it ends up having the title Mac Help and shows only the text “The selected content is currently unavailable”.
How to trouble shoot this?
ps: I don’t know when this problem started, because I do not go to the Help that often - normally I consult the ePub.
The help system of macOS can’t find the contents if they were not yet indexed, this happens especially after (re-)installing or updating the app and launching it for the first time.