First you need to set both db connections in your config file
$db['default'] = array(
and
$db['stores'] = array(
in the model you can then create a Db connection like this
$default_db = this->load->database();
or
$stores_db = $this->load->database('stores', true);
then use the object to access the two databases
$stores_db->select('reference, company, email')
On the package it said needs Windows 7 or better. So I installed Linux.