Install ATVO to a location of your choice.
The Launcher tell you that you don't have ATVO installed and downloads it's newest version.
Once the download is completed you can launch ATVO or the ThemeEditor.
Download ATVO Launcher
For running ATVO you need:
Active iRacing subscription
A computer capable running iRacing and display all cars on the track!
Microsoft Windows 7/8/8.1/10
Microsoft .NET Framework 4.5
We also highly recommend at least a second screen.