Thank you for your inquiry!

The downloads for most Sybex books are available by searching for the book at www.sybex.com. Once you locate your book in the search results, click it, and scroll to the 'Downloads' section. Click 'See More', if available, in the bottom-left corner, to see all available downloads for that title.

Mastering AutoCAD Civil 3D 2016: Autodesk Official Press Downloads

I hope this helps. Have a great day!

- Chrys