Microsoft® SQL Server® 2008 R2 SP2 - Express Edition

http://www.microsoft.com/en-us/download/details.aspx?id=30438

Microsoft SQL Server 2008 R2 Express with Service Pack 2 is a free and feature-rich database for developing and deploying SQL Server 2008 R2.

Install

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    Prerequisites Install Instructions by Microsoft
    To install or update SQL Server 2008 R2 SP2 one will need adminstrative rights on the computer.

        Step 1: Install Microsoft .NET Framework 2.0 or later from the Microsoft Download Center

        Step 2: Download SQL Server Express by clicking the SQLEXPR.EXE or SQLEXPR32.EXE link on this page. To start the installation immediately, click Run. To install SQL Server Express at a later time, click Save.
        Note: SQLEXPR32.EXE is a smaller package that can be used to install SQL Server Express on 32-bit operating systems only. The SQLEXPR.EXE package supports installing onto both 32-bit and 64-bit (WOW install) operating systems. There is no other difference between these packages.

        Step 3: Follow the installation instructions provided in the Readme. Known issues may be found in the SQL Server 2008 R2 SP2 Release Notes.

Conclusion

SQL Server 2008 R2 SP2 SQL Server 2008 R2 SP2 Feature Packs Knowledge Base article for Microsoft SQL Server 2008 R2 SP2 SQL Server 2008 R2 Hardware and Software requirements