This step is only required when you want to share your members' masterfile between several machines. You must have Firebird installed on the machines running ASE Scorer Version 9 as well as the machine where the server is running.
ASE Scorer Version 9 is developed and tested using Firebird 2.5.1.
Make sure you install both CLIENT AND SERVER.
Once the database software is installed you will no longer need to worry about its installation in any later updates of the ASE Scorer Version 9.