Overview:
You get the above message when you try to install Webgility on a new computer and that computer doesn’t have a database created.
Resolution:
You need to download SQL Server 2019 or above using the below Microsoft download URL, install it manually, and create a new database instance with services in network mode.
To install the SQL server manually, follow the steps mentioned in the below help article on How to manually install SQL for Webgility.