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GraalVM EE has a MacOS version that is free for evaluation uses. http://www.graalvm.org/downloads/

There are technical reasons we cannot have a CE for Mac OS as well. But we are working on that.

Neither. You download EE or CE from graalvm.org. Then you install using the component installer.

gu -c install org.graalvm.ruby

or from a local file

gu install ruby-installable-linux-amd64.jar