(Administrator: cmd).

: Use a series of msiexec commands to extract the base installer and apply the SP1 patch into a single, installable file.

When .NET 1.1 was released (2003), 64-bit computing was not mainstream. The first native 64-bit .NET Framework arrived with . Microsoft decided to skip backporting 64-bit support to 1.1.

Standard installation often fails on 64-bit systems with "compatibility issue" errors. Users frequently use a "slipstreaming" method to bypass these blocks: : Make a folder named C:\DotNet .

Some tech forums provide a slipstreamed version of the installer where users have hacked the MSI (Microsoft Installer) files to bypass the version checks on Windows 10. This is risky, unstable, and generally not something you want on a network-connected production machine.

Before downloading and installing .NET Framework 1.1 SP1 64-bit, ensure that your system meets the following requirements: