Download will start in about 5 secs. If not, click here
Save the downloaded .ZIP archive to a easy to get to place on your computer. such as your desktop etc.
Locate and Right Click to 'Extract' Files.
Run the RaceToy 'Launcher' application before or during your iRacing.com Simulation session is running on your computer.
The Race Toy launcher will keep RaceToy up to date as updates to the plugin are released.
You will hear some voice/audio feedback from the application that it is loaded and running once it see's an active iRacing.com Simulation session on your computer.
Enter a driving session, Practice, Qual, Testing, Race. You will hear audio feedback from the application that it is active and managing your car's on track telemetry data.
You can leave the aplication running at any time, can exit at any time. Be mindful, it will only be managing your car's data while it is running in conjuction the sim.
Further information is available here