[Bigjoos]

Im not getting into a debate about if it works or not in sub domain, i know it does.

This needs modified to tell your one up from root :

$INSTALLER09['baseurl'] = 'http'.(isset($_SERVER['HTTPS']) && (bool)$_SERVER['HTTPS'] == true ? 's':'').'://'. $_SERVER['HTTP_HOST'];

To something like this :

$INSTALLER09['baseurl'] = 'http'.(isset($_SERVER['HTTPS']) && (bool)$_SERVER['HTTPS'] == true ? 's':'').'://'. $_SERVER['HTTP_HOST'].'/Subfolder';

This :

$INSTALLER09['cookie_prefix']  = ''; // This allows you to have multiple trackers, eg for demos, testing etc.
$INSTALLER09['cookie_path']    = '';   // ATTENTION: You should never need this unless the above applies eg: /tbdev
$INSTALLER09['cookie_domain']  = ''; // set to eg:  .somedomain.com or is subdomain set to: .sub.somedomain.com

Would be something like this :

$INSTALLER09['cookie_prefix'] = '/subfolder'; // This allows you to have multiple trackers, eg for demos, testing etc.
$INSTALLER09['cookie_path'] = ''; // ATTENTION: You should never need this unless the above applies eg: /tbdev
$INSTALLER09['cookie_domain'] = ''; // set to eg: .somedomain.com or is subdomain set to: .sub.somedomain.com