Composer is a tool for dependency management in PHP. It allows you to declare the dependent libraries your project needs and it will install them in your project for you. More–> You can download Composer here. It’s updated version. Unzip it and run that .exe file. Then do following steps one by one.
DOSBox is an Emulator of an IBM PC compatible computer running a DOS OS. It’s a free software written in C++ language. Download New Version of DOSBox software from this Link. Otherwise go to Official link.