Download links for SQL Server 2008 R2 Express SP2 With Tools

Hi folks, I want to create a prerequisite for SQL Server 2008 R2 Express SP2 With Tools but I can't find the download linkid (e.g. http://go.microsoft.com/?linkid=9729746) to download Service Pack 2 . I would need the linkids for both 32bit and 64bit. Cou

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