The **R package for the text** is called astsa. The package can be obtained from CRAN and its mirrors in the usual way. See the package notes page for further information.

The 4th edition will be out early in 2017 and available for the fall 2017 semester. Stay tuned. Production progress can be monitored at Springer.com

A gentle introduction to time series analysis is available (for free):
tsaEZ.
The preface has more details.

To download R, go to CRAN and download the appropriate installation. The R issues for time series analysis page is still alive. There's a tutorial on Time Series Graphics and the R time series tutorial has been updated. Go here to get your Quick Fix.

A text on Nonlinear Time Series Analysis was published by Chapman-Hall in January 2014. The text can be used as a reference for a second course in time series analysis.