This is the primary, free, and legal source. You can download a 64-bit ISO for a 180-day evaluation.
Minimum requirements include a 1.4 GHz 64-bit CPU, 512 MB RAM, and 32 GB disk space, though for production, at least 2 GB RAM and 50 GB disk space are recommended.
Go to the official Windows Server 2012 R2 download page. Download W2012R2 Server ISO
Evaluation editions will expire in 180 days. You must activate them during this time, or they will start shutting down.
Note: Microsoft allows customers to purchase Extended Security Updates (ESUs) until 2026 for this version. If you are setting this up, This is the primary, free, and legal source
You will need to sign in with a Microsoft account and fill out registration details.
Save the ISO file, which is typically around 3-4 GB. Crucial Technical Requirements & Notes Go to the official Windows Server 2012 R2 download page
(Hyper-V or VirtualBox)? How to convert an evaluation to a full version ? Windows Server 2012 R2 | Microsoft Evaluation Center