If you are seeing a FileNotFoundException or FileLoadException for version 4.2.0.0, community consensus suggests these steps: 1. Clear Binding Redirects
You cannot download System.Net.Http.dll version 4.2.0.0 as a standalone file from an official Microsoft "download now" button. For immediate use, run the following PowerShell command as an administrator to extract it from the GAC: download system.net.http.dll version 4.2.0.0
Instead, obtain the DLL only from or through legitimate package managers. This guide focuses exclusively on safe methods. This guide focuses exclusively on safe methods
should always begin with an official Microsoft channel. The safest and simplest method for most users is installing .NET Framework 4.8, which places the correct version into the Global Assembly Cache and system directories. download system.net.http.dll version 4.2.0.0
Instead, you should rely on official Microsoft redistributable packages or trusted system repair tools. If you must download the file individually, you must verify the digital signature to ensure it belongs to Microsoft Corporation.
If you are encountering this error while running a locally compiled application or a development project, the issue is often related to how Visual Studio and the .NET Framework handle assembly unification.