I'm currently working to on the installer and with version 2.0.2 it's working fine (at least what i did so far ;) ).
But as soon as I take sapphire from the gsoc branch (everything else stays the same), I get "Fatal error: Class 'DB' not found in ...\sapphire\core\ManifestBuilder.php" - see attached screenshot (nice feature BTW :) ).
flush=1 and /db/builds don't help. There shouldn't be any cache yet anyway, as I'm just trying to install.
Any suggestions or ideas?