Download SQL Server
This file will install Microsoft SQL Server 2008 Express R2 on a computer that has no version(s) of SQL Server already installed. Use this file if you have installed your software for the first time and it has informed you that SQL has not been installed or is not found. If your computer has SQL Server 2005 already, we recommend following the article here to upgrade that instance to SQL Server 2008 Express R2. If you are reinstalling SQL Server 2008 Express R2, follow the article here instead of this one.
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​System Requirements
If your computer has Windows XP or Vista, it will need Windows Installer 4.5 and Windows .NET Framework 4.0 before this software can be installed. We also recommend running Windows Update to install any available Windows Service Packs. Windows 7 and 8 are already equipped with the requisite software for this installation.