Wow! Nice job on the installer. I previously had v0.12 and the upgrade instructions went smoothly.

The only suggestion that I have is the "future-proof" the plugin for PHP 5.5 and later where the mysql_ function calls will be deprecated. I changed /ADMIN/includes/functions/extra_functions/google_mapinator.php to contain:
Code:
<?php
  if (!function_exists('gm_check_field')) {
    function gm_check_field($tableName,$columnName){
      global $sniffer;
      
      return $sniffer->field_exists($tableName, $columnName);
      
    } //end of function
  }
... making use of the built-in Zen Cart class to "sniff" the database.