SQL Server 2008 and 2008 R2 will no longer be supported by Microsoft as of July 9, 2019.  Support for Windows Server 2008 and 2008 R2 will end on January 14, 2020.  Later support dates are available for customers under the Extended Security Update (ESU) program.   One way to do this is to upgrade to Azure.

Microsoft released a full list of products that will no longer be supported in 2019 at support.microsoft.com/en-us/help/4316957/products-reaching-end-of-support-for-2019.