The SQL Server Release Services team sent a link to it on the Update Catalog a couple of days ago:

SQL Server 2005 end of life and upgrade options

https://blogs.msdn.microsoft.com/sqlreleaseservices/sql-server-2005-end-of-life-and-upgrade-options/[/url]

Microsoft SQL Server 2005 Service Pack 4 (KB2463332)

http://catalog.update.microsoft.com/v7/site/ScopedViewInline.aspx?updateid=52cbbac2-7d6a-415b-baf8-7a3e314df491

Additionally, if you have an MSDN subscription you can get it from MSDN downloads still.