assets scripts (like bloom) don't work

Hello. New to Unity, I’m just trying to add a bloom fx to my scene. I’m working in linear, HDR is activated as well as deferred render mode.
The problem is, any script I try to add to the camera gives me the famous error :can’t add script component “bloom” because the script class cannot be found etc.
What’s wrong? Those scripts come with the standard assets, why would they have to be corrected / modified in order to work?

Thank you.

Looks like I’m the only one to have this problem? None of the standard assets scripts work … bad installation or known issue?