Download Microsoft .NET Framework 3.5 Service pack 1 (Full Package) from Official Microsoft Download Center

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Microsoft .NET Framework 3.5 Service pack 1 (Full Package)

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Microsoft .NET Framework 3.5 service pack 1 is a cumulative update that contains many new features building incrementally upon .NET Framework 2.0, 3.0, 3.5, and includes .NET Framework 2.0 service pack 2 and .NET Framework 3.0 service pack 2 cumulative updates.