https://moodle-support.hku.hk/faq/can-i-access-my-previous-turnitin-v1-assignments-after-installing-turnitin-assignment-v2-plugin

Please be noted that teachers will not be able to create any new Turnitin V1 assignments in Moodle after 31 August 2016.

All Turnitin V1 assignments created before that day are not affected and are still available for access by teachers and students.

Teachers and students can access the previous Turnitin assignments by clicking the assignment link in the Moodle course.