Or just grab the 2.6 version https://moodle.org/plugins/pluginversions.php?plugin=mod_questionnaire
No idea, give it a try 
Or just grab the 2.6 version https://moodle.org/plugins/pluginversions.php?plugin=mod_questionnaire
Or just grab the 2.6 version https://moodle.org/plugins/pluginversions.php?plugin=mod_questionnaire