As it's originally developed for modpacks and servers, the features are very limited now. So by now, you can not select the game version by GUI or download the game through SMCL itself. In most cases, ...
Mojang states that its ongoing effort to bring Vibrant Visuals to the Java Edition will mandate a change that players should note down.
The launcher updates automatically to the latest version available. No user interaction is required. The programs/games available within the launcher can either be updated manually or automatically.
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