Download Microsoft .NET Framework 3.5 Service Pack 1 from Official Microsoft Download Center

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Microsoft .NET Framework 3.5 Service Pack 1

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Microsoft .NET Framework 3.5 Service Pack 1 is a full cumulative update that contains many new features building incrementally upon .NET Framework 2.0, 3.0, 3.5, and includes cumulative servicing updates to the .NET Framework 2.0 and .NET Framework 3.0 subcomponents.