Hello Julien,
you can download the version of the multichoiceset question type for Moodle 2.4.x here:
https://github.com/jmvedrine/moodle-qtype_multichoiceset/tree/MOODLE_24_STABLE
click on the "Download ZIP" button on the right
Quiz
All-or-nothing multiple choice hangs Moodle 2.1.3
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