How to Install SQL Server Service Packs and Cumulative Updates
I am going to show around 90% of the screens once you have downloaded an update and will be using SQLServer2012-KB4091266-x64.exe which happens be the most recent at the time of this blog post On-demand hotfix update package for SQL Server 2012 SP4. You may have your favorite patching site that you prefer for SQL update, but here is an unofficial build chart lists site that has known Service Packs (SP), Cumulative Updates (CU), patches, hotfixes and other builds of MS SQL Server 2019, 2017, 2016, 2014, 2012, 2008 R2, 2008, 2005, 2000, 7.0, 6.5 and 6.0 that have been released. Microsoft SQL Server Version List https://sqlserverbuilds.blogspot.com/