Offline Launcher is a mod that you can install into the game to play in an offline mode. It can be used with any version of the game, but it is recommended to use the latest version of the game. It is an unofficial addon, so it is not associated with Mojang AB. The addon has been developed by a group of mod creators. You can download it from the official website of the mod creator.

The offline mode is intended to be used in situations where you do not have an Internet connection.