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You should have GameData\Keramzit\ProceduralFairings folder after installation for it to work properly. The parts are in Aerodynamics tab.
**Finding the KSP Main Folder**
The first step to installing an addon is to locate the KSP folder in your computer. This is where KSP keeps all of its files, including your game saves and screenshots. The KSP folder is located where you unzipped it when you first downloaded the game.
If you got KSP from Steam, right-click it in your Steam library and select "properties", then switch to "local files" tab and press "browse local files". This should open the game folder.
In the KSP main folder there's "GameData" folder which contains all addons. If you didn't install any, it'll have only "Squad" sub-folder - that's stock "addon" from the developers of the game.
Download zip-file. Open it.
It contains "GameData" folder (among other things), just like your KSP main folder.
Unzip (copy) that "GameData" folder to your KSP main folder. Now your KSP "GameData" folder should have a sub-folder for whatever addon you installed, in addition to "Squad" sub-folder and any previously installed addons.
Most likely, you don't need anything else from the zip-file. It might contain read-me files or plugin source files, but you don't need those to install the addon.
Just remove the addon folder from KSP "GameData" folder.
Note that you'll lose any ships that use parts from that add-on when you load the saved game. It might be a good idea to back up your saves.
How to use
The parts are in the Aero tab.
Put a fairing base under your payload. Remember to add a decoupler if you need one.
Attach side fairing and it'll be reshaped for your payload automatically.
Enable symmetry and you get a nice rocket. Remember to rearrange stages to jettison fairings at the proper stage.
Change your payload, and the fairings will adapt to it.
Fairing bases come in all sizes, the same side fairings can be used with all of them.