You can zip the corresponding folder if you want to use Joomlas installation manager.
It is also possible that you copy the files directly to the server and overwrite the old ones.
uddeIM & uddePF Development
CB Language Workgroup
CB 3rd Party Developer
However while I'm here I have a few queries. When I initially installed this I found that the message box when composing a new email was very small. I got round this by editing a php file. Unfortunately this has been overwritten on todays svn upgrade and I can't for the life of me find where I set it - Perhaps there is a better way?
The above basically adds the width and height required to make the box bigger. The settings in the control panel only seemed to adjust the width and not the height?