How to download and setup subnet
Open terminal and run command
                                            git clone https://github.com/twitchyliquid64/subnet.git
                                        
                                        git clone is used to create a copy or clone of subnet repositories.
                                        You pass git clone a repository URL. it supports a few different network protocols and corresponding URL formats.
Also you may download zip file with subnet https://github.com/twitchyliquid64/subnet/archive/master.zip
Or simply clone subnet with SSH
                                            [email protected]:twitchyliquid64/subnet.git