The first thing to note is that the use of this plug-in requires a special beta version of the Cairngorm SWC, which can be downloaded from http://download.macromedia.com/pub/opensource/cairngorm/plugin/cairngorm2_2_2beta-bin.zip. Download this file and unzip it to a location that you can remember.
The second thing is that, while it's not hard to use the Eclipse update manager, if you've never done it before, the instructions at the Cairngorm plug-in website are missing a few helpful details. These have been included in the instructions in this chapter.
You follow these steps to install the Cairngorm plug-in from an Eclipse update site:
Within FlexBuilder go to Help Software Updates Find and Install... (Figure 27-1).
Choose "Search for new features to install" and click Next (Figure 27-2).
Make sure the "Ignore features not applicable to this environment" and "Automatically select mirrors" options are checked and then click New Remote Site... (Figure 27-3).
Enter a name (e.g., Cairngorm Plugin) ...