Modify the instance settings to establish a strict "Maximum Server Memory" cap. This prevents SQL Server from exhausting host RAM and starving the base operating system.

To download a genuine, untampered ISO file, you must utilize official enterprise channels:

Mount the SQL Server 2012 installation ISO and run setup.exe .

Some certified IT resellers specialize in secondary market licensing. Ensure you receive a certificate of authenticity (COA) to ensure the software is legally recognized.

In the SQL Server Installation Center navigation pane, click on .

Minimum 6 GB of available hard disk space for the base engine and standard features. Software Requirements

Will this instance be used for or a isolated test/development environment ? Share public link

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Here are the legitimate avenues for acquiring a new license and download:

In the SQL Server Installation Center navigation pane, click .

Under Authentication Mode, choose .

Microsoft no longer offers SQL Server 2012 on the public evaluation center for new downloads, but for volume license / MSDN subscribers, links are structured like:

In the Server Configuration tab, set the Startup Type for the and SQL Server Browser to Automatic .

Choose as a minimum. Add Management Tools – Basic and Complete for SSMS 2012 (very old—consider using a newer SSMS version separately).