additional-privacy and and update-notifications do not load

I have downloaded both of these plugins. Installed them on the web server and they do not show up on the 'plugin' list in the administrator console in order to activate them. Plugins have been enabled on the WPMU installation. Security is set correctly and the instructions state to put these in the 'plugins' folder on the web server. I don't think that I could have possibly misinterpreted these instructions. BTW - Other plugins work just fine.

- additional-privacy (member only)
- update-notifications

what does it take to make these work?

Other people have had the same complaint on this site. I have attempted to post my issue on an a similar thread and was asked to create a new post instead.

Your help is greatly appreciated.