If you want to remove,add or edit a country you need to do a small code  change

Open file  \plugins\wpresidence-core\misc\plugin_help_functions.php and at line 336 you have function wpestate_country_list_array

To add a new country add the code like in the example bellow
$countries = array(
esc_html__("Your Country", "wpresidence-core"),
esc_html__("Afghanistan", "wpresidence-core"),