it looks like the original archive that I uploaded was missing modx_index.php I am uploading the correct version right now. So for everybody who downloads it from now everything should work fine. I am sorry for any disconvenience it may have caused.
for those of you who tried installing the script from the old archive, in index.php after $VBDIR line you should add these four:
Code:
$CURDIR = getcwd();
chdir($VBDIR);
require_once($VBDIR . "global.php");
chdir($CURDIR);