There is the case that PDF does not open out because of something error occurs. It is likely to solve according to the following procedure, please try it.

*Please test PDF file browser of the latest version when the downloaded file doesn't open it by the message such as "It is broken".
It is possible to download it here.
　http://www.adobe.com/products/acrobat/readstep2.html

　
*It might not be able to be read that it tries to read directly from a browser (Internet Explorer etc.) according to the environment and the load situation. For that case, please read the PDF form file after it downloads it to the personal computer.
Click the right button on a link to the PDF, to download it and you can save it by the operation such as "The object is preserved in the file".