Where can I download SQL Server 2008 R2 RTM now that SQL Server 2012 has come out and the old links have been redirected?
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How do I install SQL Server 2008 Express R2 SP1 to an existing R2 Express instance? - Stack Overflow
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Databases and Dead Languages: Installing BIDS 2008 R2 with Visual Studio 2008 -- SP1 is definitely Required
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