A typical error message from /logs

Code:
PHP Fatal error: 1062:Duplicate entry 'PL_DEFAULT_PROFILE' for key 'unq_config_key_zen' :: INSERT INTO configuration
            (configuration_title, configuration_key, configuration_value, configuration_description, configuration_group_id, sort_order, use_function, set_function, date_added)
         VALUES
            ('Installed Version', 'PL_INSTALLED_VERSION', 'v3.0.1', 'The plugin version currently installed.', 37 , 10, NULL , 'trim(', now()),

            ('Default Profile', 'PL_DEFAULT_PROFILE', '1', 'Choose the default profile to use.', 37 , 10, NULL , 'zen_cfg_select_option(array(\'1\', \'2\', \'3\' ),', now()),

            ('Show Profile Links?', 'PL_SHOW_PROFILES', 'true', 'Choose <em>true</em> to display links to the currently-enabled profiles on the <em>pricelist</em> page.', 37, 20, NULL, 'zen_cfg_select_option(array(\'true\', \'false\'),', now()),

            ('Show Information Sidebox Link?', 'PL_SHOW_INFO_LINK', 'true', 'Choose whether (<em>true</em>) or not (<em>false</em>) a &quot;Price List&quot; link should be shown in the Information sidebox.', 37, 30, NULL , 'zen_cfg_select_option(array(\'true\', \'false\'),', now()) ==> (as called by) /MYROOT/MY_ADMIN/includes/init_includes/init_price_list_admin.php on line 44 <== in /MYROOT/includes/classes/db/mysql/query_factory.php on line 667.
That PL_DEFAULT_PROFILE shows up in a few threads about PPL.

I could try converting from latin-1 to utf8mb4 first and then installing PPL.

I have been trying to balance not posting too often and documenting what I do off my own scratchpad.