which version of Jave Runtime Environment?

Simple answer: Whatever https://java.com/ tells you to install (it will autodetect your browser and operating system).

More nuanced answer: If you want to use Java as a browser plugin, choose the version that matches your browser. If you just want to use it without the browser, 64-bit is better. It's also fine to install both; just make sure that when you update, you update both.

Source: https://blogs.oracle.com/java-platform-group/entry/choosing_64_and_or_32

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