The Film Stock Overlays work as footage. They are not a preset or plugin to install. You just need to import it into your footage bin.
You place the Film Stock above your footage and select the blending mode multiply to see a first result.
In order to influence the overlay to look better, you need to adjust the luma curves in your color grading section.
How to use Film Stock in Premiere Pro CC: https://www.youtube.com/watch?v=NxhDiPC8meE
How to use Film Stock in FCPX: https://www.youtube.com/watch?v=h71wUByDusU
How to use Film Stock in Davinci Resolve: https://www.youtube.com/watch?v=tntQ2IEijU8