gazebo-classic
                                Gazebo classic. For the latest version, see https://github.com/gazebosim/gz-sim
                            
                        How to download and setup gazebo-classic
Open terminal and run command
                                            git clone https://github.com/gazebosim/gazebo-classic.git
                                        
                                        git clone is used to create a copy or clone of gazebo-classic 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 gazebo-classic https://github.com/gazebosim/gazebo-classic/archive/master.zip
Or simply clone gazebo-classic with SSH
                                            [email protected]:gazebosim/gazebo-classic.git                                    
                                    If you have some problems with gazebo-classic
You may open issue on gazebo-classic support forum (system) here: https://github.com/gazebosim/gazebo-classic/issuesSimilar to gazebo-classic repositories
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