This should be very familiar to us now! The scripting extension can be installed in the same way as all other extensions. Download the relevant ZIP file and then unzip its contents to the geoserver/WEB-INF/lib folder in the servlet container. However, the scripting extension is a little different in that there is a different extension for each of the supported languages. The following table lists the language and the location to download the corresponding extension; once again it is important to match the version of GeoServer. We are using the current stable version, which, at the time of writing this book, is 2.5.2.