If your company has a Volume Licensing agreement predating 2015, the physical media or ISO images might be available on your internal VLSC repository under "Previous Downloads."
Many apps that run on 2008 will run on 2012 R2. Extended Security Updates (ESU) are available through October 2026. windows server 2008 sp1 iso
The installation media for Windows Server 2008 R2 SP1 is typically provided as a single 64-bit ISO SQLServerCentral Windows Server 2008 R2 SP1 Released and Installed If your company has a Volume Licensing agreement