Purpose
Using multiple versions of JMP at the same time can be confusing because all windows have the same icons.
In addition, Windows often sends an open data file to the wrong JMP version for opening.
How to Use
To make it easier to work with multiple JMP versions, install the add-ins and you will see in each JMP window which one is JMP 17, JMP18, JMP19:

System Configuration
Add-in developed and tested using the following system configuration.
Windows
JMP 17.2
JMP 18.0.1
JMP 19 EA1