New install 1.5.8 Paypal Pro PHP Fatal error: 1062

1.5.8 New install
PHP Version: 8.1.10 (Zend: 4.1.10)
MySQL 5.7.30

Setup with a new install due to problems with PP Pro not working in my upgrade attempt previously. Setup PP Express and then when installing the Pro module I got a white page with this error message upon saving:

WARNING: An Error occurred, please let us know! If you were entering information, press the BACK button in your browser and re-check the information you had entered to be sure you entered valid data.

Hitting back or logging out and back in show both the express module and pro module gone in the list of payment modules.
Log is

[30-Oct-2022 02:38:15 UTC] Request URI: /MyAdmin/index.php?cmd=modules&set=payment&action=install, IP address: **.***.***.***
#0 [internal function]: zen_debug_error_handler()
#1 /home/gtbullet/public_html/includes/classes/db/mysql/query_factory.php(667): trigger_error()
#2 /home/gtbullet/public_html/includes/classes/db/mysql/query_factory.php(634): queryFactory->show_error()
#3 /home/gtbullet/public_html/includes/classes/db/mysql/query_factory.php(275): queryFactory->set_error()
#4 /home/gtbullet/public_html/includes/modules/payment/paypaldp.php(1218): queryFactory->Execute()
#5 /home/gtbullet/public_html/MyAdmin/modules.php(109): paypaldp->install()
#6 /home/gtbullet/public_html/MyAdmin/index.php(11): require('/home/gtbullet/...')
--> PHP Fatal error: 1062:Duplicate entry 'MODULE_PAYMENT_PAYPALDP_MERCHANT_COUNTRY' for key 'unq_config_key_zen' :: INSERT INTO configuration (configuration_title, configuration_key, configuration_value, configuration_description, configuration_group_id, sort_order, set_function, date_added) VALUES ('Merchant Country', 'MODULE_PAYMENT_PAYPALDP_MERCHANT_COUNTRY', 'USA', 'Which country is your PayPal Account registered to? <br /><u>Choices:</u><br /><font color=green>You will need to supply <strong>API Settings</strong> in the Express Checkout module.</font><br /><strong>USA and Canada merchants</strong> need PayPal API credentials and a PayPal Payments Pro account.<br /><strong>UK merchants</strong> need to supply <strong>PAYFLOW settings</strong> (and have a Payflow account)<br><strong>Australia merchants</strong> choose Canada<br><em>(This setting is really about the internal PayPal API specification, and not so much about country: US=1.5, UK=2.0, Canada/Australia=3.0)</em>', '6', '25',  'zen_cfg_select_option(array(\'USA\', \'UK\', \'Canada\'), ', now()) ==> (as called by) /home/gtbullet/public_html/includes/modules/payment/paypaldp.php on line 1218 <== in /home/gtbullet/public_html/includes/classes/db/mysql/query_factory.php on line 667.

I had the same problem and believe this might be a bug. I fixed it by commenting a line in includes/modules/paypaldp.php:

function check() {
    global $db;
    if (!defined('MODULE_PAYMENT_PAYPALDP_MERCHANT_COUNTRY')) {
//       $db->Execute("insert into " . TABLE_CONFIGURATION . " (configuration_title, configuration_key, configuration_value, configuration_description, configuration_group_id, sort_order, set_function, date_added) values ('Merchant Country', 'MODULE_PAYMENT_PAYPALDP_MERCHANT_COUNTRY', 'USA', 'Which country is your PayPal Account registered to? <br><u>Choices:</u><br><font color=green>You will need to supply <strong>API Settings</strong> in the Express Checkout module.</font><br><strong>USA and Canada merchants</strong> need PayPal API credentials and a PayPal Payments Pro account.<br><strong>UK merchants</strong> need to supply <strong>PAYFLOW settings</strong> (and have a Payflow account)<br><strong>Australia merchants</strong> choose Canada<br><em>(This setting is really about the internal PayPal API specification, and not so much about country: US=1.5, UK=2.0, Canada/Australia=3.0)</em>', '6', '25',  'zen_cfg_select_option(array(\'USA\', \'UK\', \'Canada\'), ', now())");
    }

When installing PP Pro, the check() runs before install() and the constant isn't defined so it inserts it, and then when it gets to install(), it's already there and causes an error for a duplicate entry.

Possibly not the correct solution, but it worked in my case.

Thanks for reporting. Fixed: https://github.com/zencart/zencart/pull/5500