The "Submit" option can not be active both http://www.zynqbook.com/download-book.php and http://www.zynqbook.com/download-book-chinese.php.
How to download the chinese or English version of this book?
You have to provide your personal details and then a download link is opened
I confirm that I have written it very detail. However,the "Submit/提交" option is inactive again.