Hi ShahulFaizal,
You can download Microsoft® SQL Server® 2012 Evaluation through this linkage.
https://www.microsoft.com/en-us/download/details.aspx?id=29066&WT.mc_id=aff-n-in-loc--pd
And as Mr. Olaf mentioned, SQL Server 2012 is too old to support it anymore. You can download the latest sql server evaluation version:
https://www.microsoft.com/en-us/evalcenter/evaluate-sql-server
Hope it will help.
BR
Dawn Yang
MSDN Community Support
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