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net-framework-4x-versions.md

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Important

All .NET Framework versions since .NET Framework 4 are in-place updates, so only a single 4.x version can be present on a system. In addition, particular versions of the .NET Framework are pre-installed on some versions of the Windows operating system. This means that:

  • If there's a later 4.x version installed on the machine already, you can't install a previous 4.x version.
  • If the OS comes pre-installed with a particular .NET Framework version, you can't install a previous 4.x version on the same machine.
  • If you install a later version, you don't have to first uninstall the previous version.