Hi Marcus,
FSSMC has not been tested with SQL Server 2008, therefore setup will correctly return that error. These are the supported SQL versions, as per the
User Guide:
SQL Server 2005 Standard Edition (and above), SQL Server 2005 Express Edition, or SQL Server 2000
The Express Edition will install automatically through the FSSMC setup, if you so choose that option. Otherwise you'll need to install SQL Server 2005 or 2000 and follow the instructions to setup SQL beforehand.
Kind Regards,
Andy Day | CSS Security, Sr. Support Engineer (Antigen/Forefront Server Security)