Below the various steps to update Arfooo Directory 
From version 1.0.1 to version 1.0.2 

1) Replace the following files by the new files in arfooo-1.0.2.zip: 
core/Cacher.php
admin/languages/fr.php
admin/templates/arfooo/setting/index.tpl
config/version.php

And replace the entire folder 
admin/javascript/setting