SQL Server 2005 is an older version of Microsoft's relational database management system, and its support has ended. However, I understand that you might still need it for legacy application support or other specific use cases.

The SQL Server 2005 Standard Edition 64-bit ISO can be downloaded from the Microsoft website or other reliable sources. However, please be aware that direct downloads might not be available due to the end-of-life status of the product.

Keep in mind that using older software versions may pose security risks, and compatibility issues might arise with newer systems or applications.