This is the final release of 2.3.0, which was in beta testing and is now released as a final.
2.3.1 build 81 is a different version of WeatherCat that is still in development and is more recent than 2.3.0 build 86, but is not released as a final as it is still a beta product and has some issues to be worked out.
If you don't want to deal with the beta issues, run 2.3.0. If you want to help in the development testing, run 2.3.1.