Before proceeding, it is essential to address a common misconception: Microsoft has never released a “.NET Framework 5.1”. The classic .NET Framework versioning ended with .NET Framework 4.8.1 . Version numbers 5.0 and higher refer to the modern, cross-platform .NET (Core) .

Install .NET 8.0 Runtime (x64) for modern apps, and enable .NET Framework 4.8.1 via Windows Features for legacy software. There is no official .NET Framework 5.1.

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