Support for SQL Server 2008 R2 ended on (Extended Support). However, "unsupported" does not mean "unused." Many organizations continue to run this version for several reasons:
If you already possess the ISO, the standard installation process is as follows: Sql Server 2008 R2 Iso
On modern Windows versions, you can right-click the file and select "Mount." On older systems, you may need to "map" the image using virtualization software like VMware . Support for SQL Server 2008 R2 ended on (Extended Support)