NuGet of Latest Build
Mapsui's 'Build' GitHub action creates nugets and stores them as artifacts. Go to actions, select the build you are interested in and download them at the bottom of the page.
Build your own nuget package
It is also possible to build you own nuget package locally by running scripts\buildpack.bat 3.0.0-custom.1
from the sln folder. You can set the file location as a Package Source in visual studio.