Microsoft SQL Server 2008 R2 SP3 Feature Pack .

Select the "sqlncli.msi" file for the x64 architecture.

Download link: https://www.microsoft.com/en-us/download/details.aspx?id=13255

However, you can still obtain the version from the official Microsoft Download Center via the archived SQL Server 2008 Feature Pack.

You can download the SQL Server 2008 Native Client (x64) from the following locations: