The Assignment upgrade tool was an administrator tool for upgrading assignments in Moodle 2.2 and older to the new assignment module in Moodle 2.3 onwards. It was removed from core Moodle in 3.6. See the tracker issue Remove Assignment upgrade helper from core.
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Note: You are currently viewing documentation for Moodle 3.10. Up-to-date documentation for the latest stable version of Moodle may be available here: Assignment upgrade tool.
