Missing upgrade.php file on tool_dataprivacy may cause errors when upgrading from 3.3 or 3.4

Note: I recommend to use MDK for this test. It's much easier. Setup Open a terminal Create a Moodle 3.3 instance. mdk create -i -v 33 -n moodleinstancename Go to your moodle instance's root folder. Download an older version of the data privacy plugin  (3x.0.0 or 3x.1.0). Extract the zip file to your moodle instance's " admin/tool " folder. Install the data privacy plugin by running the upgrade process. mdk upgrade Delete the data privacy tool. rm -rf admin/tool/dataprivacy Upgrade test Check out the Moodle version we're testing: 35 git checkout MOODLE_35_STABLE master git checkout master Upgrade your site mdk upgrade Confirm that the upgrade is a success and that you don't see any error messages. Smoke test Open your browser and log in as an admin. Go to " Site administration / Users / Privacy and policies / Data deletion " Confirm that the page loads successfully. Go to " Site administration / Server / Scheduled tasks " Run the " Delete expired contexts " scheduled task. Confirm the process ends successfully. Run the " Expired retention period " scheduled task. Confirm the process ends successfully. Go to " Users / Privacy and policies / Data registry " Click " Edit " and select " Purposes ". Add a purpose. Make sure you enter one or more values for " Lawful bases " and " Sensitive personal data processing reasons " fields. Confirm that the purpose is successfully created. Confirm that the values for the " Lawful bases " and " Sensitive personal data processing reasons " fields that you entered are correctly shown on the " Purposes " table. Normal upgrade Uninstall your Moodle instance. mdk uninstall -y Check a weekly release before this patch: 35 git checkout a1d8976005035b4b6253f9dcb0238829351bfe09 master git checkout 6e8235c7d3957120f16f5b9d4df8ef1ec82558b5 Install the site: mdk install Check out the Moodle version we're testing: 35 git checkout MOODLE_35_STABLE master git checkout master Upgrade your site mdk upgrade Confirm that the upgrade is a success and that you don't see any error messages.