PHP (Database Configuration is not valid)

Hello. Upon trying to install another php program, i get the error (Database Configuration is not valid). It is a POS system that uses PHP and MySQL. I have tried everything to fix it, I will post the links that I have. Thanks

Thats all of the files that I got it from.
The files that I found the database config is not valid was in database_install and setup_page ,both .php . I use xampp to test my programs. Thanks

Seems like you should just open it in your browser and enter your db credentials. Make sure the db server host and user/pass is valid

I don’t believe I have created a database?

Well did it ask for database credentials? According to the readme at github it should have

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