For 64-bit systems, the client leveraged the WOW64 (Windows-on-Windows 64) subsystem to isolate 32-bit applications from 64-bit components, but the native 64-bit driver itself performed without the overhead of emulation, making it ideal for high-throughput server applications like IIS-hosted web services or heavy ETL (Extract, Transform, Load) processes.
Once you have the .msi file, installation is straightforward, but there are caveats regarding side-by-side installations. sql server native client 11.0 64 bit download
Installing the 64-bit version of SQLNCLI11 on a modern OS (Windows Server 2019/2022 or Windows 10/11) raises several issues: For 64-bit systems, the client leveraged the WOW64