For clustered systems, upgrades must typically be performed one version at a time. Microsoft Learn recent version
Microsoft typically restricts older operating system downloads to verified customers and subscribers. windows server 2012 iso download
Microsoft no longer provides public, direct "one-click" downloads for these legacy versions on their main consumer pages. Legitimate access is restricted to: Microsoft Evaluation Center: For clustered systems, upgrades must typically be performed
As of , Microsoft no longer provides free security updates, bug fixes, or technical support for any edition of Windows Server 2012. If you must continue using this OS, consider these options: Windows Server 2012 R2 - Microsoft Lifecycle For clustered systems