[B00MER]

If your running 3.5.0:

Edit smarty.php and update the corresponding code at line 39:

#
# Define SMARTY_DIR to avoid problems with PHP 4.2.3 & SunOS
#
define('SMARTY_DIR', $xcart_dir.DIRECTORY_SEPARATOR."Smarty-2.5.0".DIRECTORY_SEPARATOR);

if (!@include(SMARTY_DIR."Smarty.class.php")) {
	if (!@include("../".SMARTY_DIR."Smarty.class.php")) {
	echo "Can't to find template engine!";
	exit;
	}
}

Should do the trick.