Edit mod/assign/version.php and add the following line to the end: $plugin->dependencies = ['format_weeks' => ANY_VERSION] ; Edit config.php , find the line that sets your database prefix ( $CFG->prefix='value'; ) and change it to a temporary value, e.g. $CFG->prefix = 'x'; Visit the root URL / of your Moodle install in a web browser. (no change) The first Installation screen, with a copyright notice, should appear. Click Continue . (no change) The Server checks page should appear. Click Continue . EXPECTED: The Moodle database tables should install successfully (this may take a few minutes to complete); the screen showing installation progress should finish with another Continue button. This is the end of the test, so you can change back the prefix in config.php and delete the added line from mod/assign/version.php . You may want to use your preferred database tools to delete the unnecessary database tables that have been created (the ones beginning with your temporary prefix name). Before this fix, at step 5 the Plugin checks page displayed and showed the following error, even though format_weeks is available.