It looks like I need to install a previous DOTNET SDK?

C:\Program Files\dotnet\sdk\2.1.202\Sdks\Microsoft.NET.Sdk\build\Microsoft.NET.TargetFrameworkInference.targets(135,5): error : The current .NET SDK does not support targeting .NET Core 3.1.  Either target .NET Core 2.0 or lower, or use a version of the .NET SDK that supports .NET Core 3.1. [C:\Users\Sixty\OneDrive\Documents\GitHub\serial-monitor\serial-monitor.csproj]
The terminal process "C:\Program Files\dotnet\dotnet.exe 'publish', 'C:\Users\Sixty\OneDrive\Documents\GitHub\serial-monitor/serial-monitor.csproj', '/property:GenerateFullPaths=true', '/consoleloggerparameters:NoSummary'" terminated with exit code: 1.

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Document the following

• Dependencies (dotnetcore 3.1+)
• Parameters
• Build instructions

I'm getting the following error:

Java 8 or more recent is required to run. Please download and install a recent Java runtime.

I have Java 8 Update 271 currently installed. I'll deal with this once I get the DOTNET version resolved...

There are a couple of ways you can package a dotnetcore program for deployment.

• You can generate a platform independent application. This requires the platform specific runtime for the right version of netcore.
• You can build a self contained platform specific executable that doesn't need a separate runtime but is platform specific.

I favour self-contained. The Arduino extension (or anything else that wants a serial monitor) must sense the platform (not difficult) and download the right one from the artefacts of this repo. This implies a CICD that produces Mac, Linux and Win10 builds on a predictable URL.