I had a user ask what are the required plug-ins for this site? The user was attempting to view a course and received an error message indicating it "requires plug-in".
Umm, is this 'theme' related? And did the message say what plugin it needed?
No. The message didn't indicate any particular theme.
So Helena, may I respectfully ask why you posted the problem on the themes forum?
That's more generally a message for something like Flash, relating to the content on the page - particularly now that Firefox has blocked Flash by default on all its browser versions.