Open the Package Manager Console in Visual Studio and run:
Uninstall the GAC version using gacutil -u Newtonsoft.Json (run as administrator), or ensure your local copy has a higher version number. newtonsoft json 12.0.0.0 download
If you are using modern .NET (Core, 5, 6, 7, 8+), you can add a package reference via the CLI: Open the Package Manager Console in Visual Studio
Install and use a NuGet package in Visual Studio (Windows only) newtonsoft json 12.0.0.0 download
You can compute the hash of your downloaded file and compare it with the official value.
Visit the official GitHub repository at https://github.com/JamesNK/Newtonsoft.Json and switch to the 12.0.3 tag.