You must have missed the message about choosing which port. The easiest way is go to RUN or open pgadmin from your windows. Double click on the 9.3 version of the install and see what databases are there, and what port number it’s on. Do the same for 9.5. If you have pt4 and want to keep it then when you load up drivehud, input the info you have for what pt4 is using, and then drivehud will create a new database in that version and connect.
If you need more help you can contact support and they can walk you through it a little more. It’s just an initial setup issue, you missed a screen when installing.