For lightweight development on ARM or containerized environments. Final Verdict
This is the most "updated" version of SQL Server 2012. You can still download the SQL Server 2012 SP4 update package directly from the Official Microsoft Download Center .
Older ISO files exist on archive.org, but:
For a full ISO that includes the latest updates (Slipstream), the Microsoft SQL Server 2012 SP1 Download Page sometimes lists (e.g., SQLServer2012SP1-FullSlipstream-ENU-x64.iso ) which allow for a fresh installation with service packs already integrated. 2. Alternatives for Modern Development