Technically, version 1.1 was designed for Windows 98, ME, NT 4.0, 2000, and XP. Installing it on modern systems presents challenges: Windows 7: Usually installs without major issues.
The Microsoft .NET Framework version 1.1.4322 was the first major update to the .NET platform, serving as the backbone for software developed in the early 2000s. While modern Windows versions ship with .NET 4.8 or .NET 6+, certain "legacy" or "abandonware" applications still require this specific version to run.
Use Compatibility Mode: If the installer fails, right-click dotnetfx.exe , go to Properties > Compatibility, and set it to Windows XP (Service Pack 3). Common Errors and Troubleshooting
Security Risks: .NET 1.1 is no longer receiving security patches. It is highly recommended to run any software requiring this version in a virtual machine (VM) or a sandbox environment rather than on your primary host machine.
Finding an official download link can be difficult because Microsoft has retired the mainstream support pages for this version.
Archive.org: The Wayback Machine often hosts original installers (dotnetfx.exe) archived from the early 2000s.