If you have the emWave PRO program already installed on your computer, it is not necessary that you install the emWave2 software program. In fact, having both of the installed on the same computer is not recommended or supported by HeartMath. Conflicts can occur between the programs and sharing the same database.
The emWave2 hand held unit is designed to work with either the emWave PRO and the emWave2 program.
The two programs share some of the same files and emWave2 is a single User only program.