The software is in Internet. You dont need to install anything from Tacticat. The only requirement is to have a not-too-old version of java in your computer.
To get a good version of Java just go to
http://www.java.com follow the instructions to downlad and install the recommended version. (Java is usually installed in the computer when you buy it but sometimes is not a complete or modern version)
Once you have the java thing ok you just go to
http://www.tacticat.com , that's the home page. Scroll down the page till you see a table with the sailing fields, we've setup some 20 different fields dedicated to fleet, match and teams racing. There is also a field just to try starts.
Enter a field pressing the desired button, they are labelled L1, L1-euro, X1, M1-aus, .... if the button has an -euro it means that this field is hosted in a european server, if it has -aus it is hosted in a Server in Brisbane (Australia) and if it has nothing it is a Dallas server. Try a field that is close where you are to begin (better response time).
If you have any problems send a mail to tacticat-AT-adecat.com
aestela.