Upgrading VQMod is same procedure irrespective of a version. Please follow below instruction.
- Download VQMod from official GitHub. Prefer OpenCart version, not standalone.
- Upload it to your OpenCart's root folder, it will replace your old VQMod
- Now run http://www.mydomain.com/vqmod/install
- Done, if you see UPGRADE COMPLETE message.
Be sure to a backup old directory, in case, failed to update, you can restore it. Check twice the downloaded VQMod has index.php file in the Install directory. If not, you probably downloaded a standalone version. Retry with OpenCart version.