Microsoft .NET Framework 3.5 Service pack 1 Beta
https://www.microsoft.com/downloads/details.aspx?FamilyId=23516C63-2DB2-4E7F-AABA-32B12D6E025C&displaylang=en
Microsoft Visual Studio 2008 Service Pack 1 Beta
https://www.microsoft.com/downloads/details.aspx?FamilyId=CF99C752-1391-4BC3-BABC-86BC0B9E8E5A&displaylang=en
NET Framework 3.5 Service Pack 1 Beta and Expression Blend
https://blogs.msdn.com/expression/archive/2008/04/18/vs2008sp1.aspx