To install or reinstall the plugin:
*For a first install:
unzip and untar the last version of the UpdateAction archive (file UpdateActionV*.tgz) under your BigBrowser directory 
(where the script BigBrowser is located): the directory plugins is created (if it not exists),
some java class files are copied in this directory

*If the plugin has already been installed:
-delete first the files UpdateActionV*.class from the plugins directory located in your BigBrowser directory 
-follow the steps for a first install