Redmine

Hi,
I got permissions and roles to configure and I would like to hide fields when somebody logs in with a client account.

because he's a client, the user is not allowed to see several fiels (time elapsed etc ...).

I've installed the plug-ins redmine_extend_permissions and redmine_fields_permissions (https://github.com/resilva/Redmine-Fields-permissions) but they don't work.
I think there's a problem of Redmine versions and compatibility : I use redmine 2.0.3.

What can I do to make it work ? I'm a Ruby Newbie ...

Thank you very much for your answers ...