Fedenet on "Can't install plugins (zenSocialShare and ZenBits)"

Hello everyone,
I'm new to the ZenPhoto world and I apologize if this is a dumb question but I'm having a hard time trying to install some third party plugins.
The plugins at issue are: zenSocialShare and ZenBits.
I downloaded them, unpacked them and uploaded them into the rootzenphoto/plugins/ directory but I can't find them in my admin panel. I cleared my cache, logged out and back in, nothing works.
Am I doing something wrong?
Help please. Thanks.