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