[Amaury]

I found a typo in your instructions. See the bold text below:

========= INSTALL or UPGRADE ========

To Install:
In Admin CP go to Plugins & Products -> Manage Products -> Add/Import Product
Click on "Choose File" and browse to the product xml file that was packaged in the .zip file.
Click "Import"

Next you must add the code below to the additional.css template of each style (Admin CP -> Style Manager -> (Choose Style) -> Edit Templates -> CSS Tmplatees -> additional.css

Also, I don't suppose you have a sidebar modification to show normal members?

EDIT: I found one by Lynne last night.