Additional issue has been found in Beta 2 version related to incompatibility with PHP 5.2.x versions. It's causing a Fatal error during the installation (PHP 5.2.17) on the Step right after Set Root password:
We should find and replace all places that use:
$count = $node->count(); // PHP > 5.3
and replace with :
$count = count($node->children()); // PHP < 5.3
Also we can add TODO comment where we specify to use 5.3+ version once we switch to it.