Thank you for the reply. Unfortunately, my explanation was not clear. Apologies.
There are Wordpress files present in the /var/www/domain_name directory, but they were installed via a separate process (thus, the error messages). My question is as follows: is it possible to either edit or remove TINYCP Application Installer files so that the built-in Wordpress installer script is removed entirely?
Error messages gone after v463 upgrade. I'll settle for that. Thank you (and kudos again for the best control panel in its category).