How to download and setup atom-narrow
Open terminal and run command
                                            git clone https://github.com/t9md/atom-narrow.git
                                        
                                        git clone is used to create a copy or clone of atom-narrow 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 atom-narrow https://github.com/t9md/atom-narrow/archive/master.zip
Or simply clone atom-narrow with SSH
                                            [email protected]:t9md/atom-narrow.git                                    
                                    If you have some problems with atom-narrow
You may open issue on atom-narrow support forum (system) here: https://github.com/t9md/atom-narrow/issuesSimilar to atom-narrow repositories
Here you may see atom-narrow alternatives and analogs
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