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I installed Minecraft 1.14.3 but it won't run.

I don't know which version of Java I need to get the game working.

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The official Minecraft system requirements lists multiple versions depending on the game version you are using:

Java 8 is required to run Minecraft versions 1.12 through 1.17. Java 17 is required to run Minecraft version 1.18 and up. If you don't know whether you have the necessary version of Java, don't worry, our installers supply Minecraft with its own version of Java by default. 

As the quote says, the launcher downloads Java for you if you don't have it already, meaning that a missing Java installation would be a launcher bug. But before you report it, please make sure that it's actually that and not a crash or other problem.

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Simply download the latest version that's compatible with your system from the official Java website.
The green 'Download' button will automatically forward you to the right file.

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The launcher is automatically downloading java 8. If you are getting crash report please post it here. If the crash report is "Failed to write core dump. Minidumps are not enabled by default on client versions of Windows" update your videocard and if the error is still showing, i can't help you. If Minecraft 1.0-1.12 is crashing it's because of fbo. Make sure to disable it from options.txt in the .minecraft folder.

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