See hackaday.io page for screenshots. Qwt is the library that provides plotting widgets for SerialPlot. You have 3 different options for Qwt. Leave it to serialplot ...
SerialPortLib is available as a NuGet package. Run Install-Package SerialPortLib in the Package Manager Console or search for “SerialPortLib” in your IDE’s package management plug-in.
A label on the back or bottom of the device The original packaging and printed instruction manual inside it The system menu in products with a user interface (e.g. TVs or cameras) Click your product ...