Blank screen pops up when clicking on the Download link wizard
The wp-config.php file cannot be found. It usually happens when the wp-config.php file is placed behind the root. Although this is a good safety measure, you may find that quite a few plugins won't work properly.
If you want to keep it that way, you can type shortcodes directly in the post or page. Here is the tutorial on using shortcodes: http://wp21century.footprintaddons.com/how-to-use-s3media-linkafe-lite/ , otherwise move the wp-config.php to the root in the domain.
Click the Shortcode tab to find the procedure, it is quite straightforward: