my results showed the same region template as Joel mentioned in his reply to the above post
I had the "DIV Region with ID" region template in the APEX view.
I'm not sure how you ended up in this situation, but you had one template associated with theme ID 24 with a name of 'DIV Region with ID'. This was in the absence of theme 24 being installed in your application.
I'll review the data integrity rules how this was even permitted in the first place. But for your specific application, I deleted the one errant row and you can now install Theme 24 into that application.