The default Dashboard is located at C:\Program Files (x86)\FRC Dashboard
The smart dashboard is a java program. The jar file for it resides at
C:\Users\<username>\wpilib\tools\SmartDashboard.ja r. It requires java to run, so if it doesn't come up, you might want to see if java is installed correctly and that there is only one copy of it. For example, I found an extra copy of java in. C:\ProgramData\Oracle\Java\javapath
This page
https://wpilib.screenstepslive.com/s/4485/m/24192/l/290135?data-resolve-url=true&data-manual-id=24192
explains how to edit C:\Users\Public\Documents\FRC\FRC DS Data Storage.ini to always run the desired dashboard. There's a bug in the driver station program where it wont remember anything other that default or labview dashboard.