If you cannot install Java and see Java Installation Not Completed, Unable to install Java, There are errors in the following switches, use these fixes.

Though Minecraft Java Edition can be downloaded and installed using Mojang's official launcher, the same can be achieved via custom launchers.

WA-Launcher Here you can download the source of the WorldAutomation.Net launcher. Feedback, complaints and content contributions are welcome.

The Jam54 Launcher is used to install and update all of the software developed by jam54. The launcher itself is written in Java and JavaFX.

Specifically, the "install" button remains stuck on "waiting on install" without the launcher downloading the necessary game files/folders.