I cannot download this PDF, it's just an empty file.
It should be here .. but it seems to be gone while the other is there..
The announcement says they are having major issues with content.
This will be why it is 0 size, as it was okay the other day.
Wait until noon CDT time and they should have fixed the issue.
edit and then its back again.
You can probably get it from http://www.embest-tech.com/shop/star/riotboard.html while the links here are not working