Running .NET Framework 1.1 on a networked machine in 2025 is . Known critical vulnerabilities that remain unpatched include:
Have a specific error not covered here? The legacy .NET communities on Stack Overflow and MSDN archives still provide valuable troubleshooting for this historic framework.
Abstract
Since this framework is legacy software, it is no longer supported on modern operating systems like Windows 10 or 11. If you must install it for a specific legacy application, you will need two separate packages:
Since there is no native 64-bit package, you need the standard .NET 1.1 SP1 installer. It will install and run correctly on 64-bit systems.
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