I suspect that the theme may have been customised by a previous developer, although I am not well experienced with Newspaper to understand what’s natively in the code and what not.

I run a “diff -r” between the active Newspaper theme directory and a freshly extracted archive of the same version, and the active folder has plenty of additional php/css files. But I am not certain whether this is conclusive evidence that the theme has indeed been tampered with.

Is there a way on knowing whether that’s the case?

Done. The result is the same :/

Thank you for the quick response.

Your first link points me to a document about creating my own plugin, is that right? We are not currently using any custom plugin or code. Am I understanding correctly that we may need to write some custom code to upgrade to the latest theme?

In regards to link for upgrading the core of tagdiv: Thank you, I have consulted that document already. It basically points out that I need to manually update the Visual Composer plugins, which I have already attempted. It always fails: