Microsoft Net Framework 1.1 Service Pack 1 64-bit Download ((hot)) Jun 2026
NDP1.1sp1-KB867460-X86.exe (Note: Even for 64-bit OS, the SP1 update often uses this installer package, as it patches the underlying 32-bit compatibility layer on x64 systems). Size: Approximately 10.2 MB. Support Status: Legacy.
Modern IIS (Internet Information Services) versions do not natively map to ASP.NET 1.1.
On 64-bit versions of Windows (such as Windows 10 or Windows 11), 32-bit applications run via the WOW64 (Windows on Windows 64-bit) subsystem. .NET Framework 1.1 installs as a 32-bit component inside this subsystem, allowing legacy 32-bit software to function on a 64-bit OS. Where to Download .NET Framework 1.1 SP1 Safely
Microsoft .NET Framework 1.1 Service Pack 1 (64-bit) File Name: NDP1.1sp1-KB867460-X64.exe (or similar) Size: Approximately 10.2 MB Installation Prerequisites
: Can be found via the Microsoft Update Catalog (KB867460) . How to Install on Windows 10/11 (64-bit) microsoft net framework 1.1 service pack 1 64-bit download
Use Hyper-V, VirtualBox, or VMware to host a Windows XP 64-bit or Server 2003 instance. This provides the best compatibility for legacy software.
Install or Windows Server 2003 64-bit inside VirtualBox, VMware, or Hyper-V. Then install .NET 1.1 SP1 natively. Run your legacy app inside the VM. This avoids all compatibility issues with modern hardware.
Microsoft® .NET Framework Version 1.1 Redistributable Package
The year was 2024, but inside the dusty server room of the Oakhaven Municipal Library, the calendar may as well have read 2003. The library’s entire archival system—a clunky, labyrinthine database containing a century of local records, genealogy charts, and land deeds—ran on a piece of software called "Archivist Pro." Modern IIS (Internet Information Services) versions do not
msiexec.exe /a C:\DotNet\netfx.msi /p C:\DotNet\SPS_Deployment.msp Finally, run the newly created to install the framework. Super User Step 3: Recommended Alternative Before manually installing 1.1, try enabling .NET Framework 3.5
Download the ( NDP1.1sp1-KB867460-X86.exe ). Steps to Install Create a Directory: Create a folder named C:\DotNet .
Create a new folder directly on your C: drive named DotNet . (Path: C:\DotNet )
What version you are currently using The exact error message or code appearing on your screen Where to Download
The question is legitimate: Why would a modern user seek out a two-decade-old service pack for a deprecated framework? The answer lies in . Countless enterprises—manufacturing plants, healthcare systems, financial institutions, and government agencies—still run custom LOB (Line of Business) applications written specifically for .NET 1.1. These applications often rely on:
Several critical security updates were released during its supported lifecycle, including: KB928366, KB929729, KB953297, KB2742604, and KB2659883. If the framework is installed on systems still within Windows Update service for older operating systems (Windows 2000, XP, Vista, Server 2003), these updates would have been applied. For installations on modern Windows, manual application of these legacy security fixes is often impractical or impossible.
Some applications designed for .NET 1.1 can run on .NET 2.0 or 3.5 via built-in redirection. Go to Control Panel > Programs and Features > Turn Windows features on or off , and check the box for .NET Framework 3.5 .
