Download the latest .jar file from the
download page (compatible with Eclipse 3.1+)
Place the .jar file into the plugins directory under the Eclipse installation directory.
If Eclipse is running you will need to restart your workbench.
If the plugin is not loaded automatically, you may need to restart Eclipse with the -clean
parameter (edit the shortcut to Eclipse and add -clean at the end of the command line).
Upgrade to the latest version
Follow the same instructions above. It is not necessary to remove the older .jar.
Upon restart you may notice discrepancies if .apt files were still open when you last closed Eclipse.
Nothing to be worried about there: Eclipse is just trying to restore your previous work session
and the old plugin isn't there. Simply close and re-open those files and everything should