Just tried to Import w_E_202207.epub file.
It replaces all Watchtower Study titles for all dates,
with the first study article #28 title The Kingdom is in Place!
Doing a search, you might have got across this one of a few days ago:https://www.theocbase.net/support-forum/post/9257-problem-to-upload-watchtower-epub-file-in-greek-language.html
Not a real answer, I'm afraid, but a relatively fast workaround anyway.
For accessing the database my personal preference is http://sqlitebrowser.org/
For editing templates I now use https://code.visualstudio.com/
Thank you for your reply.
Yes, I did see that post.
I entered all the information manually, which worked.