This is the second version of microStudio standalone. It includes recent updates: 2D / 3D libs, physics engines Matter.js and Cannon.js, support for 4 languages: microScript, Python, JavaScript, Lua. You can install this software on your PC / Mac and work offline on your microStudio projects.
microStudio standalone is recommended if you want to work offline or have no connection / unreliable connection to internet.
I still recommend using microStudio online on https://microstudio.dev if you can. It is the only way to enjoy online features, such as storage in the cloud, online collaboration, community sharing and more publishing / export options.
Projects are compatible between the online and the standalone version, you can thus easily transfer projects from one to the other using export and import features.
microStudio standalone will be updated from time to time, when a significant number of features are added to the main project. The version number (YY-MM-VV) starts with the year (YY) and month (MM) of the build and an incremental version (VV) number.