As far as I know, Ruslan hasn't made the code public. So best to ask him directly.
Cheers
Kristina
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There are now two upgraded plugins. The one you are referring to is from Tony in Portland. Ruslan also upgraded the plugin. They do differ as Ruslan already indicates in https://mahara.org/interaction/forum/topic.php?id=5300&offset=10#post24128
The plugins have not been merged into one yet. So I guess right now it might come down to your preference / what you are looking for.
Cheers
Kristina
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https://moodle.org/plugins/view.php?plugin=assignsubmission_mahara
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