Hi Marty,
You can install DashBoard 9.1 in a separate folder. Just make sure that during the installation, you specify a different folder than c:/DashBoard (something like c;/DashBoard9_0/)
If you want to make sure you don't lose your 8.1.2, then make a backup of the c:/DashBoard folder before you begin the installation (assuming that is where you installed DashBoard the last time).
I have several versions of DashBoard installed on my computer for backward compatibility test purposes.
DB9.0 and up has a new look to it. It's called the Aura theme (which in my opinion looks great!). If you want to go back to the old look you can switch to the Classic theme in preferences, under General.
#DashBoard