From here you can download the search engines for each tracker.
BTfind includes most of them, but here are the latest versions and new ones.
Inside the downloaded rar, a file called "README.txt" contains the instructions for proper installation.
You must have an Apache Server and PHP (>= 5.3.0) installed on your system. If you use Windows, I recommend you to install WampServer. This will install and do basic configuration of Apache and PHP.
For other OS, you can use XAMPP.
This guide takes as reference an installation of WampServer. Anyway, I will explain the steps manually when possible.
Once installed, run it and proceed to configure PHP:
Now you have to install BTfind. Simply, extract the rar contents to the WWW folder:
Within WWW has to be the "btfind" folder with the "index.php" and the rest of the content. That's it.
To start the program, open a browser and enter the following URI: http://localhost/btfind/index.php.
Just remove the content from "btfind" folder and extract the new one.