Qnet requires you to install a database. Supported database engines are: MS SQL, Oracle, H2 and PostgreSQL.
We recommend to use MSSQL in case of Windows based servers.
You can download the Microsoft® SQL Server® 2017 Express and management studio from the Microsoft homepage.
Step-by-step installation guide: http://docs.q-net.com/pro6/en/getting-started/installation.html#Database-install-2017