Microsoft Evaluation Center Windows Server 2012 R2If you are a developer or part of an enterprise with a Visual Studio subscription, you can access the "Subscriber Downloads" portal.
Once the ISO is downloaded, you must "burn" it to a physical device to make it bootable. Using a USB Drive (Recommended): Use a tool like windows server 2012 iso download
To download the correct ISO, you must know which edition matches your license key. Microsoft released several distinct versions: How to Download a Windows Server 2012 ISO