Please change Phar Stub to allow loading from different path:

Current stub (only works if geoip2.phar and script are in the same directory):
<?php require_once 'phar://geoip2.phar/vendor/autoload.php'; __HALT_COMPILER(); ?>

Change to:
<?php require_once 'phar://' . __FILE__ . '/vendor/autoload.php'; __HALT_COMPILER(); ?>