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A major update to the RuneScape client was released in 2016. Problems with the latest version of RuneScape, the Java client may still allow you to play. The Game Client is an open-source RuneScape launcher built by Jagex. For those who do not have Java installed or those who are having issues with Java. Jagex later placed its imprimatur on the unofficial macOS client by making it.
Mac client instructions. You need to have a version of Java installed on your system.