If you need to run an older application that requires .NET Framework 1.1, Microsoft recommends installing .NET Framework 3.5 SP1 Microsoft Learn .NET Framework 3.5
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Microsoft Net Framework 1.1 Service Pack 1 64-bit Download [new] Jun 2026
If you need to run an older application that requires .NET Framework 1.1, Microsoft recommends installing .NET Framework 3.5 SP1 Microsoft Learn .NET Framework 3.5
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