The Framework supports the operation and development of many country-specific tax microsimulation models. In order to provide that support, the Framework needs to be downloaded and installed your local computer. This process is described in the installation guide.
The best way to learn about how to how country-specific models work is to install and use INI-Tax-Analyzer, a Framework-derived microsimulation model of the Indian personal income tax that uses publicly-available data.
The best way to learn about how the Framework supports the development of new country-specific tax microsimulation models is to read about how the INI-Tax-Analyzer model can be used as a template for a new model.