Use the appropriate of the following remedies:
- Remove orphaned files in the Upgrader (using the Integrity check) feature – if you don't even want this addon but partial files from it came back
- Trigger install/upgrade of modules/blocks/addons in the Upgrader (using the Database upgrade) feature – if the database state is out-dated
- Fully reinstall or uninstall the addon in Addons – for anything else