Service Pack 4 (SP4) for Microsoft SQL Server 2005 is now available for download. SQL Server 2005 service packs are cumulative, and this service pack upgrades all service levels of SQL Server 2005 to SP4. You can use these packages to upgrade any of the following SQL Server 2005 editions:
Enterprise
Enterprise Evaluation
Developer
Standard
Workgroup
SQL Server 2005 SP4 includes SQL Server 2005 SP3 cumulative update 1 to 11, customer requested fixes, along with instances of the SQL Server 2005 SP4 database Engine support for DAC operations.