Documentation for Chevereto image hosting software (V3)
v3-docs.chevereto.com
Don't forget the most essential step: Don't panic.
In your case, there's no error. The installation is telling you to manually run these queries in SQL console to avoid the risk of corrupting your database.
Follow the advice, go to your SQL console and run the dumped queries. The system does that in some cases to avoid breaking your website, because the PHP process has a time limit which is generally lower than the time required to update a large database.