Please read the notes for the previous release:
This update introduces the capability to modify form requests and validation.
You must update your config/forms.php file otherwise Bookkeeper will fail validating your forms and models if you are upgrading from an earlier version.
Important: Please read the release note of the previous major update:
This update introduces the ability to configure Eloquent models that are used in the CRM and Finance sections.
You will need to manually add config/models.php file in order to be able to configure models if you are upgrading from an earlier version.
Furthermore, again if you are upgrading from an earlier version, you might want to manually add the newly introduced favicon and other similar files.