If necessary, you can "slipstream" Service Pack 1 into the 1.1 installer to bypass compatibility issues, which requires using command-line tools to merge the redistributable ( dotnetfx.exe ) and SP1 ( dotnetfxsp1.exe ) files into a single installation package. Super User
Note: This process is technical and may vary based on your specific Windows build. Important Considerations download net framework 1.1 windows 10 64-bit
By editing these keys, you can force .NET 1.1 assemblies to load on 64-bit processes – something Microsoft never intended. If necessary, you can "slipstream" Service Pack 1 into the 1
If you absolutely must run .NET 1.1:
If the application specifically demands version 1.1 and fails to run with version 3.5 enabled, you can attempt a manual installation using the official redistributable package. download net framework 1.1 windows 10 64-bit