Please help me with the default login name and password for octopus-microfinance-suite 3.4.0?
There is no default login name and password. That form you encounter on startup actually refers to the connection to the SQL server. You need to have a SQL server installed on your computer and set up with a username and password. You then use the ID and password of the SQL server to connect to the database to initiate the initial configuration.
Use the following page to learn how to install a SQL server: https://msdn.microsoft.com/en-us/library/ms143219.aspx