For the 32-bit version, look for files containing x86 , such as SQLServer2008R2SP1-KB2528583-x86-ENU.exe .
To download and install SQL Server 2008 R2 SP1 on a Windows 7 32-bit (x86) system, you must select the architecture-specific package, typically labeled . SQL Server 2008 R2 reached its end of extended support on July 9, 2019 , meaning it no longer receives official security updates unless part of a specific legacy program. Key Download Information
You can find relevant packages on the Microsoft Download Center , though SP3 is the most recent cumulative update and is generally recommended over SP1.
For a free, lightweight version, the SQL Server 2008 R2 Express installer is frequently used for local development on Windows 7. System Requirements for Windows 7 (32-bit) Microsoft® SQL Server® 2008 R2 SP2 - Express Edition
The 32-bit version of SQL Server 2008 R2 SP1 is designed for systems with x86 processors.