How to download and setup nau
Open terminal and run command
                                            git clone https://github.com/Nau3D/nau.git
                                        
                                        git clone is used to create a copy or clone of nau 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 nau https://github.com/Nau3D/nau/archive/master.zip
Or simply clone nau with SSH
                                            [email protected]:Nau3D/nau.git                                    
                                    If you have some problems with nau
You may open issue on nau support forum (system) here: https://github.com/Nau3D/nau/issuesSimilar to nau repositories
Here you may see nau alternatives and analogs
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