CodeRunner is a question type plugin. Installation instructions for coderunner can be found here: https://github.com/trampgeek/moodle-qtype_coderunner#installation The instructions explain that you also need to install the question behaviour plugin qbehaviour-adaptive_adapted_for_coderunner. Furthermore, if you want to do much more than briefly evaluate coderunner you will need to install a Jobe sandbox server to run the jobs. All this is explained in the above install instructions.
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How to install CodeRunner locally in Moodle on win10?
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