SQL Server 2008 R2 Service Pack 3 and SQL Server 2008 Service Pack 4 . Service Packs are available for download on the Microsoft Download Center.
SQL Server 2008 R2 SP3 and SQL Server 2008 SP4 contain fixes to issues Hotfix solutions provided in SQL Server 2008 R2 cumulative updates up to and including Cumulative Update 13, and SQL Server 2008 cumulative updates up to and including Cumulative Update 17.
The Service Packs also include the security bulletin MS14-044. SQL Server 2008 and 2008 R2 are now in extended support, which means there will not be Cumulative Updates for these Service Packs.
Miocrsoft will not release Cumulative Updates for SQL Server 2008 R2 SP3.
