"When mutants kill and destroy all that matters in your life---What can you do? As the last hope of a dead town, will you seek justice for the dead and help for the survivors? Or will you lose your way in this big nasty world that's waiting for you? Can anyone, for that matter, good or evil, survive for long in a world where most problems are solved at the end of a knife or with a burst of gunfire?"
If the Installer doesn't work for you for some reason, or if you're already familiar with installing Fallout 2 mods, you can try the Manual Install. Download the ZIP file into your Fallout 2 installation directory and unpack it there. A new folder should appear, named "MutantsRising". Go inside it and read the readme for the remaining installation details.