If you are trying to install the missions with a retail version of CZ extract the zips into Valve\Condition Zero\czeror and overwrite files.
If you are installing into a Steam version of CZ extract the zip files into Steam\SteamApps\email folder\condition zero deleted scenes\czeror and overwrite files.
When using Steam you may need the Steam_wads.zip found here.
To run the maps use the console or get the custom mission loader here.
You extract the mission_loader.zip file the same as the missions into your czeror folder.
You can then load the missions by entering the training area and selecting the custom missions instead of using the console.
Good luck man.