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