.NET Framework 3.5 will no longer be included as an optional Windows component starting with Windows 11 Insider Preview Build 27965. Instead, it must be installed via a standalone installer for legacy applications. This change affects future Windows releases but not Windows 10 or Windows 11 through 25H2. The shift aligns with .NET Framework 3.5's approaching end of support on January 9, 2029, and Microsoft encourages migration to newer .NET versions. Detailed guidance, installers, and migration paths are available on Microsoft Learn.
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