Double click on the msa2v320exe.zip file and then double click on the install.exe file. This will start an installer with simple step-by-step instructions. When the installation is complete, two icons will appear on your computer's desktop. Double click on the MASTAN2v3 icon to start MASTAN2. Note that it may take up to a minute for the program to initially start. The second icon provides access to an interactive tutorial.