How to download and setup opus
Open terminal and run command
                                            git clone https://github.com/kepler155c/opus.git
                                        
                                        git clone is used to create a copy or clone of opus 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 opus https://github.com/kepler155c/opus/archive/master.zip
Or simply clone opus with SSH
                                            [email protected]:kepler155c/opus.git                                    
                                    If you have some problems with opus
You may open issue on opus support forum (system) here: https://github.com/kepler155c/opus/issuesSimilar to opus repositories
Here you may see opus alternatives and analogs
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