The best way to install Raygun4Net.AspNetCore is to use use the dotnet cli tool. In your project folder run dotnet add package Mindscape.Raygun4Net.AspNetCore to install it.

Another method is to directly edit your .csproj file and add "Mindscape.Raygun4Net.AspNetCore": "6.6.6" to your dependencies. After you've done this, run dotnet.exe restore or restore packages within Visual Studio to download and install the package.

Alternatively, visit https://www.nuget.org/packages/Mindscape.Raygun4Net.AspNetCore/ for instructions on installation.