This is the R package for the text and it can be obtained in various ways. See the package notes for further information.
A gentle introduction to time series analysis is available (for free):
The preface has more details.
A short course,
ARIMA Modeling With R, which is based on this text, is available at
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.
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.