Hi,
thank you for your post.
If you are interested in the fuzzylite library, you can find documentation at http://www.fuzzylite.com/downloads on fuzzy logic control. For installing, you can check http://fuzzylite.com/cpp/.
If you are interested in the visual application, namely QtFuzzyLite, you can follow the (old) video tutorial at http://www.fuzzylite.com. The application is an executable which you can download for your platform at http://www.fuzzylite.com/downloads. You have to purchase a license to use the most recent version.
Cheers.