Both the in-house WordPress upgrade and the cPanel upgrade were tried which resulted in a database error. I had to delete the theme in cPanel. WordPress then forced me to fix the database. A few minutes later, I was able to access D&L in its default theme.
I’m sticking with this theme for now. I’m contemplating whether to finally release a new theme for the site. I’m lazy, so if JT updates his theme, I might just with Options. No pressure.