Atrium Integrator is just a complement to what is already installed with ARS, that is why the installation is in the same folder as ARS.
I installed ARS in the D: Drive and Atrium Integrator was installing in the C: Drive. After checking with BMC Support, following steps were done:
1. Delete the AIInstalledConfiguration.xml & AIInstallingConfiguration.xml file from %temp% directory
2. Run the installer again & you can provide the location again.
On a machine where AI was already installed, following steps were done.
1. Copied AtriumIntegrator Directory to D: Drive, similar to the ARS installation path.
2. Updated all references in ProductRegistry.xml & AIInstalledConfiguration.xml file.
Thanks & Regards,