To set up your Brain Gauge, visit http://corticalmetrics.com in your web browser. Click on the Download App button in the upper right-hand corner of the screen.
Once the app installer has finished downloading, open the file (brain-gauge.dmg on Mac, brain-gauge-app.exe on Windows) and follow the steps on the screen to complete the installation.
When the installation is complete, the app should load automatically. If not, click on the Pro Tools icon from your desktop (or the folder you selected during installation).